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Question: A launch takes 3 hours to go downstream from point A to point B and 6 hours to come back. Time taken...

A launch takes 3 hours to go downstream from point A to point B and 6 hours to come back. Time taken by this launch to cover the distance AB downstream when its engine cut-off is –

A

3 hr

B

6 hr

C

9 hr

D

12 hr

Answer

12 hr

Explanation

Solution

T = 2t1t2t2−t1\frac{2t_{1}t_{2}}{t_{2} - t_{1}}= 12 hr