Boats and Streams MCQ Set 1

Showing question 1 to 5 of total 30 MCQs

Solve the question on your notebook and check it by clicking (Answer and Explanation) below question.

Question No: 1

A man can row upstream 10 kmph and downstream 20 kmph. Find the man rate in still water and rate of the stream.

1. 0,5
2. 5,5
3. 15,5
4. 10,5

Question No: 2

A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2 hours 30 minutes to cover a distance of 5 km upstream. Find the speed of the current.

1. 1 km/hr
2. 2 km/hr
3. 3 km/hr
4. 4 km/hr

Answer: A

Explanation

First of all, we know that

speed of current = 1/2(speed downstream - speed upstream) [important]

So we need to calculate speed downstream and speed upstream first.

Speed = Distance / Time [important]

Question No: 3

In one hour, a boat goes 11km along the stream and 5 km against it. Find the speed of the boat in still water

1. 6
2. 7
3. 8
4. 9

Question No: 4

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is

1. 2 km/hr
2. 3 km/hr
3. 4 km/hr
4. 5 km/hr

Answer: D

Explanation

Let the speed of the stream be x km/hr. Then, Speed downstream = (15 + x) km/hr, Speed upstream = (15 - x) km/hr So we know from question that it took 4(1/2)hrs to travel back to same point. So,

Question No: 5

If Rahul rows 15 km upstream in 3 hours and 21 km downstream in 3 hours, then the speed of the stream is

1. 5 km/hr
2. 4 km/hr
3. 2 km/hr
4. 1 km/hr