two pipes a and b can fill a cistern in 20 minutes and 25 minutes both are opened together but at the end of 5 minutes B is turned off. How much longer will the cistern take to fill?
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Answer:
11mins
Step-by-step explanation:
5+x/20 +5/25=1
5+x/20 +1/5 =1
5+x/20+4/20 =1
x=11mins
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