[6 km] Distance between a point of A and point B in a river is 12 km and the flow of the stream is from A t

For Competitive Exams

Distance between a point of A and point B in a river is 12 km and the flow of the stream is from A to B. If the speed of the boat is 4 km/h and speed of the stream is 2 km/h. The boat goes from B to A and then comes back. What is the distance between point A and the boat after 7 hours of travel since the time of starting?

2 km

3 km

4 km

6 km

Explanation:

The resulting speed in upstream is 4 – 2= 2 km/h.

And the resulting speed in downstream is 4 + 2= 6 km/h.

Since the boat is moving upstream from B to A.

So time taken is 12/2 =6 hours.

Now in downstream it takes 12/6 =2 hours

So in 1 hour it will travel half the distance = 6 km.

So the distance of the boat from point A after 7 hours of travel will be 6 km.

Additional Questions

A steamer can go 12 km in still water in 25 minutes. One day, it went 11.25 km upstream and returned the same distance in downstream. If the difference between the time taken to travel upstream and downstream was 12.5 minutes, then what was the speed of stream in km per hour?	Answer
A boat travels upstream from point A to B in 5 hours. What is the distance between A and B, if it takes 2.5 hours to travel downstream from point B to A and speed of stream is 1 km per hour?	Answer
Meera covers 20 km upstream in 600 minutes and she also covers 60 km downstream in 5 hours. Then find the rate of current of the river.	Answer
If the ratio of speed of boat in downstream and speed of stream is 9 : 1, speed of current is 3 km per hr, What would be the distance travelled in upstream by the boat in 5 hours?	Answer
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Distance between a point of A and point B in a river is 12 km and the flow of the stream is from A to B. If the speed of the boat is 4 km/h and speed of the stream is 2 km/h. The boat goes from B to A and then comes back. What is the distance between point A and the boat after 7 hours of travel since the time of starting?	Answer

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