Question : Two trains of lengths 200 m and 250 m are running on parallel rail tracks at speeds of 68 km/hr and 50 km/hr, respectively. In how much time (in seconds) will they cross each other if they are running in the same direction?
Option 1: 90
Option 2: 85
Option 3: 80
Option 4: 75
Correct Answer: 90
Solution : Total distance = 200 + 250 = 450 Relative speed = 68 – 50 = 18 km/hr = $18\frac{5}{18}$ = 5 m/s Total time taken = $\frac{\text{Total distance}}{\text{Relative speed}}$ = $\frac{450}{5}$ = 90 seconds Hence, the correct answer is 90.
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