A river of width 200 m is flowing from west to east with a speed of \(18 km / h\). A boat, moving with speed of \(36 km / h\) in still water, is made to travel one-round trip (bank to bank of the river). Minimum time taken by the boat for this journey and also the displacement along the river bank are _ and _ respectively.

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Answer & Solution

Correct Answer

(C) 40 s and 200 m

Step-by-step Solution

Detailed explanation

Minimum time :
\(t _{\min }=\frac{200}{10}=20 sec\)
\(t_{\min }=\frac{200}{10}=20 sec\)
For round trip \(=40 sec\).
Displacement along river bank \(=40 \times 5=200 m\)

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