Question
Physics Question on Relative Velocity
At a metro station, a girl walks up a stationary escalator in 20 sec. If she remains stationary on the escalator, then the escalator take her up in 30 sec. The time taken by her to walk up on the moving escalator will be
A
25 sec
B
60 sec
C
12 sec
D
10 sec
Answer
12 sec
Explanation
Solution
The correct answer is (C) : 12 sec.