A person standing on the escalator takes time t 1 to reach the top of a tower when the escalator is moving. He takes time t 2 to reach the top of the tower when the escalator is standing. How long will he take if he walks up on a moving escalator?
Text Solution
Verified by ExpertsThe correct answer is:
D
Let h = height of escalator
v = speed of escalator
u = speed of walking of man
t 3 = time taken to reach tower if man walks up on a moving escalator.
h = vt 1 = ut 2 = (v + u) t 3
⇒ t 3 = 
; v = 
; u = 
∴ t 3 = 
= 
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