Two trains each having a length of 160 meters moving in opposite direction crossed each other in 9 s...........

Quantitative Aptitude (CPO) Problems on trains

Two trains each having a length of 160 meters moving in opposite direction crossed each other in 9 seconds. If one train crossed a 200metrelong platform in 27 seconds, then the ratio of their speeds is

9:7

2:3

5: 8

3:4

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Master Problems on trains

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Explanation:

Correct 1: 9:7
Length of each train is 160 m
Let speed of first and second train be x m/sec and y m/sec respectively.
As we know,
Speed = Distance/time
⇒x=(160+ 200)/18
⇒x=360/18
⇒x= 20 m/sec
(x+y)=(160+ 160)/9
⇒9 (20+ y) = 320
180+9y=320
9y=320-180
⇒ y = 140/9 m/sec
Speed ratio of x: y = 20: 140/9 9:7