Question

A boat can move at 30.0km/h in still water.how long will it take to move 12km downstream in a river flowing 6.0km/k?
(Ans:20min)
How???

Answer 1

Speed of boat in still water = 30 km/h
Speed of stream = 6km/h

So speex in downstream = 30 + 6
= 36km/h
Convert it in metre/ min

36km/h = (36×1000)/60
= 600metre/min

Distance = 12km
= 12000m

Time = Distance/Speed
= (12000/600) min
= 20 min

So time taken to travel 12 km = 20 min

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