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JEE Main 20 July 2021 Shift 2 Solved Paper
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© examsnet.com
Question : 2
Total: 90
A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time
t
1
. If he remains stationary on a moving escalator then the escalator takes him up in time
t
2
. The time taken by him to walk up on the moving escalator will be:
[20 Jul 2021 Shift 2]
t
1
t
2
t
2
−
t
1
t
1
+
t
2
2
t
1
t
2
t
2
+
t
1
t
2
−
t
1
Validate
Solution:
L
=
Length of escalator
V
b
∕
e
s
c
=
L
t
1
When only escalator is moving.
V
e
s
c
=
L
t
2
when both are moving
V
b
∕
g
=
V
b
∕
c
s
c
+
V
c
s
c
V
b
∕
g
=
L
t
1
+
L
t
2
⇒
[
t
=
L
V
b
∕
g
=
t
1
t
2
t
1
+
t
2
]
© examsnet.com
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