1.

Taps A and B can fill a tank full in 3 hours. Tap B alone can fill the empty tank in 2 hours. How long will tap A take to vacate the tank if it is 25% filled. 1). 1.5 hours2). 2 hours3). 2.5 hours4). 3.2 hours

Answer»

Let the capacity of the tank = X ltr

Time TAKEN by A and B to fill the tank = 3 hr

Tank filled by A and B in 1 hr = x/3

Time taken by B to fill the tank = 2 hr

Tank filled by B in 1 hr = x/2

Tank filled by A in 1 hr = x/2 - x/3 = x/6

Time taken by A to completely empty the tank = 6 hr

Time taken by A empty the 25% (1/4 )tank = 6 × (1/4) = 1.5 hr



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