8. A man can swim 4 km/hr in still water. If the
speed of the stream be 2 km/hr , find the time
taken by him to swim to a place 12 km/ upstream and back
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Step-by-step explanation:
The speed of man in upstream=4-2=2
Time=d/s
=12/2
=6 hr to row upward
The speed of man in downstream=4+2=6
Time=d/s
=12/6
=2 hr to row downward
Total Time = 6+2=8 hr in total to row upstream then downstream.......
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