To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The ti

Question

To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?

Options:

A . 5 min

B . 10 min

C . 15 min

D . 20 min

Answer: Option A
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