A pump can fill a tank in 4 hours, but due to leak, the tank now gets filled in 5 hours. How long will it take the leakage to empty the tank when it is full ?
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part of the tank a pump can fill in 4 hours is equal to 1
part of the tank account can fill in 1 hour is equal to 1 by 4
part of the tank account can fill in 1 hour is equal to 1 by 4
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