a boat travels with a speed of 8 km per hour in still water and the same boat with speed 4 km per hour. then time taken for round tip if length of river is 8km?
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Speed in still water=timedistance=(8+8)/2=8km/h
Now speed during going down the stream motion will be 8+4=12km/h so time taken in down the stream journey t1=speeddistance=8/12=2/3hour
Speed during up the stream will be 8−4=4km/h so time in going down the stream, t2=speeddistance=8/4=2Hour
Time for the trip, t1+t2=2Hour40Minutes
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