Two pipes can fill a tank in 6 hours and 9 hours. How long to fill together?

A3 hours

B3.6 hours

C4 hours

D5 hours

Explanation

Rate = 1/6 + 1/9 = (3+2)/18 = 5/18. Time = 18/5 = 3.6 hours.

Exam Relevance

Topic: Work and Time
Subtopic: Pipes

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