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A cistern is provided with two pipes A a...

A cistern is provided with two pipes A and B. A can fill it in 20 minutes and B can empty it in 30 minutes. If A and B be kept open alternately for one minute each, how soon will the cistern be filled ?

A

121 मिनट

B

110 मिनट

C

115 मिनट

D

120 मिनट

Text Solution

Verified by Experts

The correct Answer is:
D
दो मिनट में टंकी का भरा भाग = `1/20-1/30=(3-2)/60=1/60`
`therefore` पूरी टंकी भरने में लगा समय = `2xx60` = 120 मिनट
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