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Explanation:

Let there be x and y inlet and outlet pipes respectively.

∴ x + y = 11                   … (i)

Assume that the capacity of the tank is 35 units.

So, inlet pipe fills 5 units and the outlet pipes empties 7 units of the tank in one hour.

The completely filled tank empties in 7 hours.

∴ 7y – 5x = 5                  … (ii)

Solving the two equations, we get y = 5 and x = 6

Hence, option (d).

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