Two Goods train 144m and 156m in length are running towards each other on parallel lines one at the ...........

Quantitative Aptitude (CDS) Problems on trains

Two Goods train 144m and 156m in length are running towards each other on parallel lines, one at the rate of 50 kmph and another 58 kmph. At what time will they be clear of each other from the moment they meet?

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Explanation:

Total distance to cover (144+156)m = 300 m
Relative speed of Goods train = ( 50 +58 )kmph = 108 kmph
= 108(5/18) m/sec = 30m/sec
Time is taken by the Goods train to pass each other
=Time taken to cover 300m at 30 m/sec
= (300/30)sec = 10sec