Question

two pipes A and B fill a tank in 20hrs and 30 hrs respectively.if a and b are opened alternatively for one hour each, how many hours will be taken to fill the tank ??​

Answer 1

Step-by-step explanation:

In 30 hrs B fills the total 1 part of the tank. In 1 hr 1/30 th part of the tank B fills. So together A & B in 1 hr fill (1/24)+(1/30)=9/120 =3/40th part of the tank . 1 part is filled in 1÷3/40=40/3 hrs.

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