Two trains, each 700 meters long, are moving in opposite directions at speeds of 45 km/h and 55 km/h. How long will it take for the trains to completely pass each other?
Show answer & explanation
Correct answer: D
Explanation
Total length of both trains = 700 + 700
= 1400 meters
Relative speed = 45 + 55
= 100 km/h
= 100 × 5/18
= 250/9 m/s
Time = Distance / Speed
= 1400 / (250/9)
= 1400 × 9 / 250
= 50.4 seconds