two trains 110m and 100m long are running on parallel tracks, in the same direction with a speed of 46 km/hr and 39 km/hr respectively. How long will it take to be clear of each other?
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Answer:
Reltative speed = (50 - 45) km/h = 5 km/hr
⇒
5
×
5
18
m
/
s
=
25
18
m
/
s
e
c
According to question,
25
18
=
110
+
90
t
⇒
t
=
200
×
18
25
=
144
s
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