1.

A norson walks up a stationary escalator in tis. If he is standing on elevator, then elevator carrieshim up in tz S. The length of elevator is lIf man starts to walk on moving escalator in the direction of motion of escalator, then time taken by theman to move up is9.(B)-12(C) t + ta(D) ti- t2tly

Answer»

l/t1 = speed of man = s1l/t2 = speed of escalator = s2Now, the relative speed = s1 + s2 = l(t1 + t2) /(t1*t2) Time taken = l/(s2+s1) = t1*t2/(t1+t2) option A



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