Question: 4. A man is stepping down a downward moving escalator. He takes 10 steps to reach the bottom. As soon as he comes down he

4.

A man is stepping down a downward moving

escalator. He takes 10 steps to reach the

bottom. As soon as he comes down he

realizes that he had left his wallet, so he runs

back with 5 times the earlier speed. Now he

takes 50 steps to reach the top of the

escalator. Find the number of steps on a Stationary escalator.

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