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Question

The speed of a boat in still water is 8 km/hr and speed of the stream is 3 km/hr. Find time taken by boat to go 30 km upstream.

A
2 hrs
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B
7 hrs
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C
3 hrs
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D
6 hrs
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Solution

The correct option is D 6 hrs

speed of the boat=8 km/hr

speed of the stream=3 km/hr

If the speed of the boat in still water is x km/hr and speed of the stream is y km/hr then speed upstream=(xy) km/hr

Therefore speed upstream=83=5 km/hr

distance=30 km

time=distancespeed

time=305

time=6 hrs



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