A man can row a boat at 8 kmph in still water. If the speed of the river is 2 kmph , it takes 48 minutes to row to a place and come back. How far is the place from the starting point?
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Speed of boat=8 km/hr
Speed of river=2 km/hr
Let the distance be d
Speed in upstream=(8-2)km/hr
=6 km/hr
Time=D/S
=d/6 hrs
Speed in downstream=(8+2)km/hr
=10 km/hr
Time=D/S
=d/10 hrs
Total time taken=48 mins
=48/60 hrs.
A.T.P
d/6+d/10=48/60
8d/30=48/60
d=48*30/60*8
d=3 km
Speed of river=2 km/hr
Let the distance be d
Speed in upstream=(8-2)km/hr
=6 km/hr
Time=D/S
=d/6 hrs
Speed in downstream=(8+2)km/hr
=10 km/hr
Time=D/S
=d/10 hrs
Total time taken=48 mins
=48/60 hrs.
A.T.P
d/6+d/10=48/60
8d/30=48/60
d=48*30/60*8
d=3 km
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