A train 108m long moving at a speed of 50km h cross another train 112m long coming from the opposite...........

Quantitative Aptitude (CDS) Problems on trains

A train 108m long moving at a speed of 50km/h cross another train 112m long coming from the opposite direction in 6 seconds. The speed of the second train is?

62 km/hr

172 km/hr

127 km/hr

267 km/hr

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Explanation:

total length of both train is=108+112
=220m
time=distance/time
50km/h=500/36 m/s,another train speed is x m/s
t=6 second
t= 220/(50/36)+x
6=220/(25/18)+x
25/3+6x=220
6x=660-25 /3
=635/3
x=635/18 m/s
speed in km/hr =127 km/hr