Question

A cistern is provided by two taps $A$ and $B . A$ can fill it in 20 minutes and $B$ in 25 minutes. Both the taps are kept open for 5 minutes and then the second is turned off. The cistem will be completely filled in another (a) 11 minutes (b) 10 minutes (c) 15 minutes (d) 12 minutes 

   A cistern is provided by two taps $A$ and $B . A$ can fill it in 20 minutes and $B$ in 25 minutes. Both the taps are kept open for 5 minutes and then the second is turned off. The cistem will be completely filled in another
(a) 11 minutes
(b) 10 minutes
(c) 15 minutes
(d) 12 minutes
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The Pearson Guide to Objective Arithmetic for Competitive Examinations
The Pearson Guide to Objective Arithmetic for Competitive Examinations
Dinesh Khattar 2nd Edition
Chapter 14, Problem 17 ↓

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Step 1

- Tap A can fill the cistern in 20 minutes, so its rate is \( \frac{1}{20} \) of the cistern per minute. - Tap B can fill the cistern in 25 minutes, so its rate is \( \frac{1}{25} \) of the cistern per minute.  Show more…

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A cistern is provided by two taps $A$ and $B . A$ can fill it in 20 minutes and $B$ in 25 minutes. Both the taps are kept open for 5 minutes and then the second is turned off. The cistem will be completely filled in another (a) 11 minutes (b) 10 minutes (c) 15 minutes (d) 12 minutes
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