A tap fills a bucket in 6 minutes while another empties it in 8 minutes. If both are open, how long to fill bucket?

A12 min

B16 min

C20 min

D24 min

Explanation

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

Exam Relevance

Topic: Work and Time
Subtopic: Pipes

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