The speed of the boat in standing water is 10 kmph. The boat rows upstream up to a certain point and comes back to the starting point. If the speed of the stream is 4 kmph then find the average speed for the total journey ?

47/5

42/5

57/5

None

Average Speed = (Upstream x Downstream)/Man's rate in still water = (10 - 4) (10 + 4)/10 = 42/5 km/hr

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