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Quantitative Aptitude

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Work and Time

Question
11 out of 30
 

Two pipes A and B filled a tank in 28 minutes and 42 minutes respectively. And another pipe C can empty the tank in 42 minutes. If all the three pipes are opened together at the same time, in how many minutes can the tank be filled?



A 42 minutes
B 35 minutes
C 30 minutes
D 28 minutes
E None of These

Ans. D

Let work be 84 unit

When all pipe open together they fill (3 + 2 – 2 = 3 unit) in one hour

So, they fill 84 unit in


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