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  4. A boat takes 2 hours to travel 8km and back in still water lake.With water velocity of 4 kmph the time taken for going upstream of 8km and coming back is.

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Q. A boat takes 2 hours to travel 8km and back in still water lake.With water velocity of 4 kmph the time taken for going upstream of 8km and coming back is.

Motion in a Plane

Solution:

$V_B = \frac{8 + 8}{2} = 8 kmph$
$t = t_1 + t_2 = \frac{8}{\nu_B + \nu_r} + \frac{8}{\nu_b - \nu_r} = 160 min$