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QUESTION
Q
A man can walk up a moving ‘up’ escalator in 30 sec. The same man can walk down this moving ‘up’ escalator in 90...

Solution

Let the length of the escalator be 90 ft(There is no loss of generality in making this assumption.) Let the speed of the escalator be y ft per second and the man’s...

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In the summer of 2012, in New Delhi, the mean temperature of Monday to Wednesday was 41ºC and of Tuesday to Thursday was 43ºC. If the…

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