Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in? - Study24x7
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1008 followers study24x7 22 Apr 2021 02:27 PM study24x7 study24x7

Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?

A

7 min

B

13 min

C

23 min

D

9 min

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