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What is the correct answer?
4
A train, 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel ?
A.
650 meter
B.
555 meter
C.
500 meter
D.
458 meter
Correct Answer :
C. 500 meter
Let length of tunnel is x meter
Distance = 800+x meter
Time = 1 minute = 60 seconds
Speed = 78 km/hr = 78*5/18 m/s = 65/3 m/s
Distance = Speed*Time
⇒
800
+
x
=
65
3
×
60
⇒
800
+
x
=
20
×
65
=
1300
⇒
x
=
1300
-
800
=
500
So the length of the tunnel is 500 meters.
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