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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:__________?

/ Basic Maths Mcqs, Mathematics Mcqs, Time and Work Mcqs / By
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:__________?

A. 5 min
B. 10 min
C. 15 min
D. 20 min