Question

A tap can empty a tank in one hour. A second tap can empty it in minutes. If both the taps operate simultaneously, how much time is needed to empty the tank?

Medium

Solution

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hour minutes
Rate of emptying the tank by the two taps are and of the tank per minute respectively.
Rate of emptying the tank when both operate simultaneously 
of the tank per minute.
Time taken by the two taps together to empty the tank minutes.

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