Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 15hr.

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 15hr. If all pipes are opened simultaneously, then the cistern will be filled in

Quiz

Answer/Solution

8.57 hr

Steps/Work

Solution:
Work done by all the tanks working together in 1 hour.
1/10+1/12−1/15=7/60
Hence, tank will be filled in 60/7=8.57 hour
Option(C)

Physics Calculator / Auto Solver

Two pipes can fill the cistern in hr and hr respectively, while the third empty it in hr. If all pipes are opened simultaneously, then the cistern will be filled in

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