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28. A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 6 hours.How long will it take to fill the cistern if both the tap and the pipe are openedtogether?Right answer will be marked as brainliest and rated five star Spam will be reported and, I will report spammers 20 more answers so it is better not to spam ‚Äč

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199 cents Vladimir

A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours.

Let tap A fill the cistern and tap B empty the cistern.

Work done by tap A = 1/4

Work done by tap B = 1/9

Work done to fill the tap when both are opened =1/4-1/9



Thus, time taken to completely fill the cistern =5/36

=7.2 hrs
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