Question

Pipe 'X' is capable of emptying a tank in 15 hours. When Pipe 'Y', which adds 2.4 liters of water per hour, is also used, it takes 25 hours to empty the tank. Determine the tank's total capacity.

A 25 litres
B 90 litres
C 55 litres
D 75 litres
E none of these
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