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Q1
:
A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:
A
48 km/hr
B
54 km/hr
C
66 km/hr
D
82 km/hr
Solution
ANS:
D
- 82 km/hr
Let the speed of the second train be
x
km/hr.
Relative speed
= (
x
+ 50) km/hr
=
(
x
+ 50) x
5
m/sec
18
=
250 + 5
x
m/sec.
18
Distance covered = (108 + 112) = 220 m.
220
= 6
250 + 5
x
18
250 + 5
x
= 660
x
= 82 km/hr.
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250 + 5