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Q1
:
A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:
A
130
B
500
C
540
D
360
Solution
ANS:
C
- 500
Speed =
78 x
5
m/sec
=
65
m/sec.
18
3
Time = 1 minute = 60 seconds. Let the length of the tunnel be
x
metres.
Then,
800 +
x
=
65
60
3
3(800 +
x
) = 3900
x
= 500.
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