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A man walks up a stationary escalator in 90 s. When this man stands on a moving escalator, he goes up in 60 s. The time taken by the man to walk up the moving escalator is.

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48 s

36 s

30 s

45 s

answer is C.

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Detailed Solution

Speed of man walking = $\frac{D}{90}$

Speed of escalator = $\frac{D}{60}$

The speed of the man+ escalator= $\frac{D}{90} + \frac{D}{60} = \frac{D}{36}$

Time taken= $\frac{D}{\frac{D}{36}} = 36 \sec$

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