Three pipes, A, B, & C are attached to a tank. A & B can fill it in 20 & 30 minutes respectively while C can empty it in 15 minutes. If A, B & C are kept open successively for 1 minute each, how soon will the tank be filled?

rahul

• Dec 8th, 2017

A and B can fill the tank as 1/20+1/30=5/60 for 2 mins C an empty it as -1/15 i.e, -4/60in 1 min Now together they will fill 5/60-4/60=1/60 for 3 mins So at the end of 55th successive (to match wit...

Ratan

• Sep 4th, 2017

Why should we add those units?

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