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Two taps M and N can alone fill a tank in 80 minutes and 120 minutes respectively. But due to a leakage of tank, it took 12 more minutes to fill the tank. In how many hours, the leak can alone empty the full tank? A) 240 B) 230 C) 248 D) 256
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1 Answer

A

A and B can fill tank in (1/80 + 1/120) = 1/48 so 48minutes

But it took 12 more minutes, this means the tank got full in 48+12= 60 minutes

So (1/80 + 1/120 – 1/x) = 1/60

1/X=1/80+1/120-1/60

Solve, x = 240
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