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  • A person climbs up a stalled escalator in 60 s . If standing on the same but escalator running with constant velocity he takes 40 s. How much time (in seconds) is taken by the person to walk u

A person climbs up a stalled escalator in 60 s . If standing on the same but escalator running with constant velocity he takes 40 s. How much time (in seconds) is taken by the person to walk up the moving escalator?

Option: 1

24


Option: 2

27


Option: 3

37


Option: 4

45


Answers (1)

best_answer

As we discussed in

Speed -

Rate of change of distance with time.

Formula

v=\frac{distance }{speed}

Speed = \frac{Change\, in \, distance}{change \, in\, time}

Person speed walking on escalator takes 60 s

standing the escalator without walking the speed is  40 s

Let the distance travelled on an escalator in each case be l

So the time to go up the escalator

\\ \frac{l}{t}=\frac{l}{60}+\frac{l}{40} \\ \\ t=\frac{60\times 40}{100}=24s

 

Posted by

Anam Khan

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