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Q.

A boat can travel with speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr then the time taken by the boat to go 68km down stream is

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a

2 hours

b

5 hours

c

3 hours

d

4 hours

answer is C.

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Detailed Solution

Speed of the boat in still water=13kmph

Speed of stream=4kmph

Speed in down stream=(13+4)kmph=17kmph

Distance travelled in down stream=68kmph

time=distancespeed =6817=4hours

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A boat can travel with speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr then the time taken by the boat to go 68km down stream is