Question

A 300 metre long train is moving at an average speed of 27 km/hr. Another train of length 160 metre is moving at an average speed of 45 km/hr in a parallel track in opposite direction. How much time is needed for the trains to cross each other? a) 20second b) 14second c)46second d) 23second​

Answer 1

Answer:

23 second

Step-by-step explanation:

total distance = 300+160 = 460 m

total speed = 27+45= 72km/hr = 72 ×5/18 = 20m/s

time = 460/20 = 23 second