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Q.

A man can row the boat at 5km/hr in still water. If the velocity of the current is 1 km/hr and it takes him 1 hour to row to a place and come back, how far is the place?


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a

2.5 km

b

3 km 

c

2.4 km 

d

3.6 km 

answer is C.

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Detailed Solution

Concept- When the boat is travelling in the direction of speed of the current then the boat is said to go in the downstream. Downstream the speed of the boat is high compared to the normal speed because the water current speed also pushes the boat in the same direction.
Speed downstreamQuestion Imagekmph = 6kmph
Speed upstream=Question Imagekmph = 4kmph
Let the required distance be x km.
Then Question ImageQuestion ImageHence, the correct option is 3.
 
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