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Unformatted text preview: Speed against direction = (180x) mph Now according to the question both time are same so 30 12 360 360 12 900 1260 7 5 5 900 7 1260 ) 180 ( 5 ) 180 ( 7 180 5 180 7 = = == + + =+ == + x x x x x x x x x x x Speed of wind will be 30 mph #64). Filling a tank. A water tank has an inlet pipe and drain pipe. A full tank can be emptied in 30 minutes if the drain is opened and an empty tank can be filled in 45 minutes with the inlet pipe opened. If both pipes are accidentally opened when the tank is full, then how long will it take to empty the tank? min tan x k the empty to time = Sum of total work equals to 1 90 2 180 180 2 1 180 2 1 180 4 6 1 45 30 = = = = ==x x x x x x x x Tank will be empty in 90 minutes...
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 Spring '10
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