Tap A and tap B can fill a tank in 20 hours and 25 hours respectively. If both the taps are opened together,then find the time after which tap B must be closed so that the whole tank can be filled in 16 hours
Let the total work = 100 units The tank filled by A in 1 hour = 5 units The tank filled by B in 1 hour = 4 units The tank filled by A in 16 hours = 16 x 5 = 80 unit Time taken by B to filled remaining tank (i.e.20 units) = 20/4= 5 hours hence, the Required time will be = 5 hours
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