A pipe can fill a tank in 6 hours and another pipe can empty it in 8 hours. If both are opened together, how long will it take to fill the tank?

A12 hours

B18 hours

C24 hours

D30 hours

Explanation

Net rate per hour = 1/6 – 1/8 = (4 – 3)/24 = 1/24. Time to fill = 24 hours.

Exam Relevance

Topic: Work and Time
Subtopic: Pipes and Cisterns

Submitted by: mcqstutor Team More Mathematics MCQs →