Syntel Company Numerical Ability Time Distance and Speed

A faulty evilvator moves 2m up and then slips 0.5 meter down. How long will it take to reach the top floor of a
building which is 50m high?

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Syntel Other Question

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?
Find the ratio of radius of the sphere to the height of the cone if the volume and the radius of both sphere and
cone are equal.