Two trains of lengths 250 metres and 350 metres will cross each other in _____ seconds when moving in opposite directions with speeds 35 km per hour and 25 km per hour.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 36.
Total length = 250 + 350 = 600 m
Relative speed = (35 + 25) km/h = 60 × 5/18 = 50/3 m/s
Time = 600 ÷ (50/3) = 36 sec