Two trains of length 120m and 180m are travelling in opposite directions at the uniform speed of 34 km/h and 32 km/h. The time taken by the two trains to pass each other is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 180/11 sec.
Calculations:
Speed of first train in m/s = 34 × 5/18 = 85/9
Speed of second train in m/s = 32 × 5/18 = 80/9
Relative speed will be the sum of the speed of both the trains = (Speed of first train + Speed of second train)
= 85/9 + 80/9 = 165/9 m/s
Required time taken = Total length/speed = (120 + 180)/(165/9)
= 300 × (9/165) = 180/11 sec