A boat takes 2 hours to travel 8 km and back in still water. If the velocity of water is 4 kmph, the time taken for the journey will be
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the boat remains still in second case as velocity of boat and water are same.
t=d/Vb
2=8/Vb
Vb=4km/hr.
second case:
t'=d/(Vb-Vw)
t'=8/(4-4)
t'=infinity.
so boat remains still
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