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A tank is normally filled in 4 hours. But it takes 5 hours to fill, when there is a leak at the bottom of the tank.

If the tank is full, in how many hours can it be emptied by the leak?

[IB ACIO Grade II Previous Paper 5 (Held on: 19 Feb 2021 Shift 2)]
A
B
C
D

EXPLANATION

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