Two trains 160 meter long and 140 m long respectively run at the rate of 77 kmph and 67 kmph respectively in opposite directions on parallel tracks. How long do they take to pass each other?



[ A ]    4.5 seconds
[ B ]    5.5 seconds
[ C ]    6.5 seconds
[ D ]    7.5 seconds right
Answer : Option D
Explanation :
time = $160 + 140 \over 77 \times {5 \over 18} + 67 \times {5 \over 18 }$

= $300 \over {5 \over 18} \times 144 $

= $300 \over 40$

= 7.5 seconds

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