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Problems on Trains - General Aptitude

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 360

C 500

D 540

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.