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Question

An empty tank can be filled by an inlet pipe in 10 hours, while an outlet pipe can empty it in 15 hours. If we open (N - 1) outlet pipes of the same capacity and (N + 1) inlet pipes also of the same capacity, the tank is filled in 3 hours. Determine the number of inlet pipes used.

A 4

B 5

C 6

D 3

E 7

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