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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
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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