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Q.
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.
360
C.
500
D.
540
View Answer
Correct choice: C
Explanation:
Speed =[ 78 x ( 5/18 ) ] m/sec = 65/3 m/sec. Time = 1 minute = 60 sec. Let the length of the tunnel be x metres. Then, [ (800 + x )/ 60 ]= 65/3 3(800 + x) = 3900 x = 500.
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