Posted by **mamta** on Wednesday, July 6, 2011 at 3:17am.

Q- The distance from A to B is l. A plane flies at constant speed v relative to air along straight line from A to B & then from B to A. Calculate total time taken for his round trip, if a wind is flowing in three directions of wind velocity (u)-

I)along the line ATO B

II)perpendicular to line AB

III) At an angle Ѳ to AB

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