There are two taps X and Y which are used to fill up a tank.

If both taps are on, then the tank will be filled in 40 minutes.

If only tap X is on, then the tank takes 60 minutes to be filled.

If both taps are on, then the tank will be filled in 40 minutes.

If only tap X is on, then the tank takes 60 minutes to be filled.

How much time will it take just tap Y to fill up the tank?

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