IIM Rohtak 2020 sample paper Question Two pipes P and Q can fill a tank in 20hrs and 25hrs respectiv

Описание к видео IIM Rohtak 2020 sample paper Question Two pipes P and Q can fill a tank in 20hrs and 25hrs respectiv

Two pipes P and Q can fill a tank in 20hrs and 25hrs respectively while a third pipe R can empty the tank in 30hrs. If all the pipes are opened together for 10hrs and then pipe R is closed then in what time the tank can be filled.
a) 400/23 hrs b) 400/27hrs c) 200/23 hrs d) 200/27 hrs

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