91.A
boat can travel with a speed of 13 km/hr in still water. If the speed of the
stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
[A]
2 hours
[C]
4 hours
[B]
3 hours
[D]
5 hours
Answer : [C]
Explanation :
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Speed
downstream = (13 + 4) km/hr = 17 km/hr.
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Time
taken to travel 68 km downstream =
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68
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hrs
= 4 hrs
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17
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