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SSC :: SSC CHSL Quantitative Aptitude

SSC CHSL » Quantitative Aptitude » General Questions - Discussion

1 .


Two trains running in opposite directions cross a man standing on the platform in 27 and 17 seconds respectively and they cross each other in 23 seconds. What is the ratio of their speeds?

[ A ]    Insufficient data
[ B ]    3 : 1
[ C ]    1 : 3
[ D ]    3 : 2 right
Answer : Option D
Explanation :
Let the speed of the trains be x and y respectively

length of train 1 = 27x

length of train 2 = 17y

Relative speed = x+ y

Time taken to cross each other = 23 sec

$27x + 17 y \over x + y$ = 23

$27x + 17 y $ = 12 (x + y)

4x = 6y

$x \over y$ = $6 \over 4$ = $3 \over 2$ = 3 : 2
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