Syntel Company Numerical Ability Pipes and Cistern

There are 3 pipes A, B and C that when opened simultaneously would fill a tank in 20 minutes. C can fill the tank
twice as fast as A which in turn would fill the tank twice as fast as B. How long will it take for B alone to
fill the tank?

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Syntel Other Question

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?
A 100m train fully covers a pole near it's track in 10s. What is the speed of the train?