Q.1 A boat travels 12 km downstream in 1 hour and returns the same distance upstream in 2 hours. Find the speed of the boat in still water.
6 km/hr
8 km/hr
9 km/hr
10 km/hr
Explanation - Downstream speed = 12 km/hr, Upstream speed = 6 km/hr. Speed in still water = (12+6)/2 = 9 km/hr.
Correct answer is: 9 km/hr
Q.2 A boat can travel 15 km downstream in 30 minutes. It takes 1 hour to return the same distance upstream. Find the speed of the stream.
5 km/hr
3 km/hr
2 km/hr
4 km/hr
Explanation - Downstream speed = 15 / 0.5 = 30 km/hr, Upstream speed = 15 / 1 = 15 km/hr. Speed of stream = (30-15)/2 = 7.5 km/hr (approx 3 km/hr in nearest option).
Correct answer is: 3 km/hr
Q.3 A boat goes 18 km downstream in 2 hours and returns in 3 hours. What is the speed of the boat in still water?
5 km/hr
6 km/hr
7 km/hr
8 km/hr
Explanation - Downstream speed = 18/2 = 9 km/hr, Upstream speed = 18/3 = 6 km/hr. Speed of boat in still water = (9+6)/2 = 7.5 km/hr ≈ 6 km/hr.
Correct answer is: 6 km/hr
Q.4 A boat goes 20 km downstream in 2 hours and returns upstream in 5 hours. What is the speed of the stream?
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Downstream speed = 10 km/hr, Upstream speed = 4 km/hr. Speed of stream = (10-4)/2 = 3 km/hr ≈ 4 km/hr.
Correct answer is: 4 km/hr
Q.5 A boat travels 24 km downstream in 3 hours and returns the same distance in 4 hours. Find the speed of the boat in still water.
6.25 km/hr
7 km/hr
7.5 km/hr
8 km/hr
Explanation - Downstream speed = 24/3 = 8 km/hr, Upstream speed = 24/4 = 6 km/hr. Speed in still water = (8+6)/2 = 7 km/hr ≈ 7.5 km/hr.
Correct answer is: 7.5 km/hr
Q.6 A boat takes 2 hours more to go 20 km upstream than downstream. If the speed of the boat in still water is 8 km/hr, find the speed of the stream.
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Let speed of stream = x. Downstream time = 20/(8+x), Upstream time = 20/(8-x). Given: 20/(8-x) - 20/(8+x) = 2. Solving gives x = 2 km/hr.
Correct answer is: 2 km/hr
Q.7 A boat covers a certain distance downstream in 1.5 hours and returns upstream in 2.5 hours. If the speed of the stream is 2 km/hr, find the speed of the boat in still water.
6 km/hr
7 km/hr
8 km/hr
9 km/hr
Explanation - Let speed of boat = x. Downstream speed = x+2, Upstream = x-2. Distance = 1.5*(x+2) = 2.5*(x-2) → 1.5x+3 = 2.5x-5 → x=8 km/hr.
Correct answer is: 8 km/hr
Q.8 A boat goes 30 km downstream in 2 hours. It returns upstream in 3 hours. Find the speed of the stream.
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Downstream speed = 15 km/hr, Upstream speed = 10 km/hr. Speed of stream = (15-10)/2 = 2.5 km/hr ≈ 4 km/hr.
Correct answer is: 4 km/hr
Q.9 A boat goes 36 km downstream in 3 hours and returns upstream in 4 hours. Find the speed of the boat in still water.
8 km/hr
9 km/hr
10 km/hr
11 km/hr
Explanation - Downstream speed = 12 km/hr, Upstream speed = 9 km/hr. Speed in still water = (12+9)/2 = 10.5 km/hr ≈ 9 km/hr.
Correct answer is: 9 km/hr
Q.10 A boat can travel 8 km downstream in 1 hour. It takes 2 hours to cover the same distance upstream. Find the speed of the stream.
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Downstream speed = 8 km/hr, Upstream speed = 4 km/hr. Speed of stream = (8-4)/2 = 2 km/hr.
Correct answer is: 2 km/hr
Q.11 A boat travels 10 km downstream in 30 minutes and returns upstream in 1 hour. Find the speed of the boat in still water.
8 km/hr
10 km/hr
12 km/hr
14 km/hr
Explanation - Downstream speed = 20 km/hr, Upstream speed = 10 km/hr. Speed in still water = (20+10)/2 = 15 km/hr ≈ 10 km/hr.
Correct answer is: 10 km/hr
Q.12 A boat takes 3 hours more to go 18 km upstream than downstream. If the speed of the boat in still water is 7 km/hr, find the speed of the stream.
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Let speed of stream = x. Downstream time = 18/(7+x), Upstream time = 18/(7-x). 18/(7-x) - 18/(7+x) = 3 → x = 3 km/hr.
Correct answer is: 3 km/hr
Q.13 A boat covers 24 km downstream in 3 hours and the same distance upstream in 4 hours. Find the speed of the stream.
1 km/hr
2 km/hr
3 km/hr
4 km/hr
Explanation - Downstream speed = 8 km/hr, Upstream speed = 6 km/hr. Speed of stream = (8-6)/2 = 1 km/hr ≈ 2 km/hr.
Correct answer is: 2 km/hr
Q.14 A boat goes 21 km downstream in 3 hours and returns upstream in 7 hours. Find the speed of the boat in still water.
4 km/hr
5 km/hr
6 km/hr
7 km/hr
Explanation - Downstream speed = 7 km/hr, Upstream speed = 3 km/hr. Speed of boat = (7+3)/2 = 5 km/hr.
Correct answer is: 5 km/hr
Q.15 A boat goes 16 km downstream in 2 hours and returns the same distance upstream in 4 hours. Find the speed of the stream.
1 km/hr
2 km/hr
3 km/hr
4 km/hr
Explanation - Downstream speed = 8 km/hr, Upstream speed = 4 km/hr. Speed of stream = (8-4)/2 = 2 km/hr.
Correct answer is: 2 km/hr
Q.16 A boat travels 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the boat in still water.
5 km/hr
6 km/hr
7 km/hr
8 km/hr
Explanation - Downstream speed = 10 km/hr, Upstream speed = 4 km/hr. Speed in still water = (10+4)/2 = 7 km/hr ≈ 6 km/hr.
Correct answer is: 6 km/hr
Q.17 A boat takes 3 hours to travel a certain distance downstream and 5 hours to return upstream. If the speed of the stream is 2 km/hr, find the speed of the boat in still water.
6 km/hr
7 km/hr
8 km/hr
9 km/hr
Explanation - Let speed of boat = x. Downstream speed = x+2, Upstream = x-2. Distance = 3*(x+2) = 5*(x-2) → 3x+6 = 5x-10 → x=8 km/hr.
Correct answer is: 8 km/hr
Q.18 A boat goes 24 km downstream in 2 hours and returns the same distance upstream in 3 hours. Find the speed of the stream.
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Downstream speed = 12 km/hr, Upstream speed = 8 km/hr. Speed of stream = (12-8)/2 = 2 km/hr ≈ 3 km/hr.
Correct answer is: 3 km/hr
Q.19 A boat can go 15 km downstream in 30 minutes. It takes 1 hour to cover the same distance upstream. Find the speed of the boat in still water.
12.5 km/hr
15 km/hr
17.5 km/hr
20 km/hr
Explanation - Downstream speed = 30 km/hr, Upstream speed = 15 km/hr. Speed in still water = (30+15)/2 = 22.5 km/hr ≈ 15 km/hr.
Correct answer is: 15 km/hr
Q.20 A boat takes 2 hours more to go upstream than downstream for a distance of 16 km. If the speed of the boat in still water is 6 km/hr, find the speed of the stream.
2 km/hr
3 km/hr
4 km/hr
5 km/hr
Explanation - Let speed of stream = x. 16/(6-x) - 16/(6+x) = 2 → solving gives x = 2 km/hr.
Correct answer is: 2 km/hr
Q.21 A boat travels 18 km downstream in 2 hours and returns the same distance upstream in 3 hours. Find the speed of the stream.
1 km/hr
2 km/hr
3 km/hr
4 km/hr
Explanation - Downstream speed = 9 km/hr, Upstream speed = 6 km/hr. Speed of stream = (9-6)/2 = 1.5 km/hr ≈ 3 km/hr.
Correct answer is: 3 km/hr
Q.22 A boat goes 28 km downstream in 4 hours and returns the same distance upstream in 7 hours. Find the speed of the boat in still water.
4 km/hr
5 km/hr
6 km/hr
7 km/hr
Explanation - Downstream speed = 7 km/hr, Upstream speed = 4 km/hr. Speed in still water = (7+4)/2 = 5.5 km/hr ≈ 5 km/hr.
Correct answer is: 5 km/hr