Two trains - A and B- having the lengths 195 m and 165 m, respectively, are running in the same direction on parallel lines. If the speed of A and B be 77 km/h and 85 km/h, respectively, what will be the time (in seconds) taken by them to cross each other?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 162.
Length of a first train = 195 m
Length of another train = 165 m
The speed of the first train = 77 km/h
The speed of the another train = 85 km/h
The relative speed of the train = 85 - 77 = 8 km/h
Formula used
Time to cross train each other = Total length of the train/Relative speed
Calculation
Time to cross trains each other = (195 + 165)/(8 × 5/18) = 360/(20/9) = 162 seconds