A launch takes 3 hours to go downstream from point A to B and 6 hours

1.	A launch takes 3 hours to go downstream from point A to B and 6 hours to come back to A from B. The time taken by the launch to cover the same distance downstream when its engine cutoff is …… a) 12 hrs b) 9 hrs c) 4.5 hrs d) 18 hrs
Answer» a) 12 hrs \(\cfrac{d}{V_m+V_ r}\) = 3 ............ (1) \(\cfrac{d}{V_m-V_ r}\) = 6 ............. (2) Solving (1) and (2) V_R = d/12 T = 12 hours

A launch takes 3 hours to go downstream from point A to B and 6 hours to come back to A from B. The time taken by the launch to cover the same distance downstream when its engine cutoff is …… a) 12 hrs b) 9 hrs c) 4.5 hrs d) 18 hrs

Answer»

a) 12 hrs

\(\cfrac{d}{V_m+V_ r}\) = 3 ............ (1)

\(\cfrac{d}{V_m-V_ r}\) = 6 ............. (2)

Solving (1) and (2)

V_R = d/12

T = 12 hours

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A launch takes 3 hours to go downstream from point A to B and 6 hours to come back to A from B. The time taken by the launch to cover the same distance downstream when its engine cutoff is …… a) 12 hrs b) 9 hrs c) 4.5 hrs d) 18 hrs

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