If a tap can fill a tank in 6 hours and another can empty it in 8 hours, how long to fill if both are open?

A20

B24

C26

D28

Explanation

1/6 – 1/8 = (4-3)/24 = 1/24. 24 hours.

Exam Relevance

Topic: Work and Time
Subtopic: Pipes and Cisterns

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