Syntel Company Numerical Ability Pipes and Cistern

2 pipes can fill a tank in 10 and 20 minutes if the tank is perfect. But there is a hole in the tank that can
empty it in 30 minutes. If both the pipes are opened simultaneously, how long will it take to fill the tank?

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Syntel Other Question
LCM of 3 no's is 120 which of the following no must not be their HCF

a. 8 b.24 c.12 d.24 e. 30 There are two pipes that can idependently fill a tank in 20 minutes. Both these pipes are opened together and
when the tank is half filled, one of them is shut. How long will it take to fill the tank from the moment when
the pipes were opened?