It takes a boat 3 hours to travel down a river from point A to point B, and 5 hours to travel up the river from B to A. How long would it take the same boat to go from A to B in still water?
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Speed in still water=
time
distance
=(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 t
1
=
speed
distance
=8/12=2/3hour
Speed during up the stream will be 8−4=4km/h so time in going down the stream, t
2
=
speed
distance
=8/4=2Hour
Time for the trip, t
1
+t
2
=2Hour40Minutes
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