Question

Two pipes a nd b can fill a tank in 20 minutes and 30 respectively. If both pipees are opened together the time to filll the tank is

Answer 1

See the concept here is that in one minute, a and b will fill 1/20 and 1/30 of the tank respectively. If both are opened together, in one minute, they will fill (1/20 + 1/30) of the tank

That is 5/60 = 1/12

So, the total time taken to fill when both pipes are opened together is 12minutes.

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