Kinematics Question 386

Question: A boat takes 2 hours to travel 8 km and back in Still Water Lake. With water velocity of $ 4km{{h}^{-1}} $ , the time taken for going upstream of 8 km and coming back it’s

Options:

A) 160 minutes

B) 80 minutes

C) 100 minutes

D) 120 minutes

Show Answer

Answer:

Correct Answer: A

Solution:

Velocity of boat = $ \frac{8+8}{2}=8km{{h}^{-1}} $ Velocity of water $ =4k{{m}^{-1}} $

$ t=\frac{8}{8-4}+\frac{8}{8+4}=\frac{8}{3}h=160\text{ minute} $



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