Two trains are running in opposite directions towards each other with speeds of 54 km h and 48km h n...........

Quantitative Aptitude (CDS) Problems on trains

Two trains are running in opposite directions towards each other with speeds of 54 km/h and 48km/h respectively. If the length of the train is 250m and they cross each other in 18 seconds, the length of the other trains is?

410

310

420

510

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Explanation:

let length of other train is L2
total length is L2+250 m
time=distance/time
speed is 54km/h =15 m/s and 48 km/h =40/3 m/s
18=L2+250 /(15+40/3)
18(85)=3L2+750
1530=3L2
L2=510 m