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Multiple Choice Questions

Sham can row a boat at 10kmph in still water IF the speed of the stream is 6kmph the time taken to r...........

Quantitative Aptitude (Pb Patwari) Boats and Streams

Sham can row a boat at 10kmph in still water. IF the speed of the stream is 6kmph, the time taken to row a distance of 80km down the stream is ?

4 hours

5 hours

3 hours

2 hours

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Explanation:

Explanation:
Given:
Speed in still water, ½ (a+b) = 10 km/hr
a+b = 20 km/hr…………….(1)
speed of the stream, ½ (a-b) = 6km/hr
a-b = 12 km/hr …………….(2)
(1)+(2 ) we get 2a = 32
a = 16 km/hr
speed downstream =distance traveled / time taken
time taken = 80/16 = 5 hours

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