Syntel Company Numerical Ability Time Distance and Speed

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

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Syntel Other Question

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?
The driver of a passenger train travelling at 40kmph notices that a goods train moving in the opposite direction
fully passes by him in 12s. What is the length of the goods train if it is travelling at a speed of 60kmph?