Question

22. A person walks up a stationary escalator in time 8min. If he remains stationary on the escalator, then it
can take him up in time 12 min. How much time would it take him to walk up the moving escalator?
(A) 10 min
(B) 4/6 min
(C) 4.8 min
(D) None of these​

Answer 1

Answer:

a. As the escalator is stationary, so the distance covered in t1 seconds is L which is the length of the escalator.

Speed of man w.r.t. the escalator, vme=t1L

b.When the man is stationary, by taking man as a reference point the distance covered by escalator is L in time t2.

Speed of escalator, vc=t2L

c. Speed of man w.r.t. the ground, vm=vme+vc_

⇒vm=t1L+t2L =L[t11+t11]= L[t1t2t1+t2]

∴t=vmL=[t1+

Answer 2

Answer:

ya it is right

Explanation:

ans 8 can't know