A river

A river is flowing at a speed of 5 km/h. A man can swim 20 km/h in still water. The man starts swimming from A to B, distance 30 km. After reaching B the man turn back and stop swimming after reaching point A . Find the total time.

Final Answer:

t =  3.2 h

Step-by-step explanation:

v1=5 km/h v2=20 km/h x=30 km  v3=v2+v1=20+5=25 km/h v4=v2v1=205=15 km/h  t3=x/v3=30/25=56=1.2 h t4=x/v4=30/15=2 h  t=t3+t4=1.2+2=3.2 h



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