Entry Test MCQ :: Time and Work Problems

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Two pipes A and B can fill a tank in 14 and 21 hrs respectively. If both pipes are opened together then after how many hours A should be closed so that tank is full in 7 hours.

[A].	28/5 hrs	[B].	6.5 hrs
[C].	5 hrs	[D].	4 hrs

Answer: Option A

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