Pipes Raj and Vikas can fill a tank in 20 and 30 minutes respectively, – McqOptions

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1.	Pipes Raj and Vikas can fill a tank in 20 and 30 minutes respectively, then a third faulty pipe Akash can empty the tank in 1 hour. If both the pipes Raj and Vikas bad pipe Akash are opened simultaneously and if the tank is empty initially, then how much time will it take to fill it?
A.	14
B.	cannot be known
C.	15
D.	13
Answer» D. 13

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