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Aptitude day 248

Problems to solve on Pipes and cisterns:

1. A pipe can fill a tank 4 times as fast as another pipe. If together they can fill the tank in 28 minutes, then the slower pipe alone will be able to fill the tank in:

2. Pipes A and B together can fill a cistern in 2 hours. Had they been opened separately, Then B would have taken 4 hours more than A to fill it. How much time will be taken by A to fill it separately?

  

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