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Two pipes P and Q, together can fill a cistern in 20 minutes and P alone can in 30 miutes. Then Q alone can fill the cistern in?

A62 minutes

B61 minutes

C60 minutes

D51 minutes

Answer:

C. 60 minutes


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A and B together can finish a work in 16 days, while B can do the same work alone in 24 days. In how many days can A alone finish the work ?
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