Question

A passenger train travelling at 15kms/hr completely passes a goods’ train travelling at 25kms/hr in the opposite direction in 10.8 secs. If the passenger train is twice as long as the goods train, find the length of each train.

Answer 1

Answer:

length of goods train = 10m

length of passengers train = 20m

Step-by-step explanation:

let,

length of goods train = x m, then

length of passengers train = 2x m

Now,

A/Q,

time = total length/speed difference

10.8 sec = (x+2x)m/(25-15)km/h

10.8 sec = 3x/10km/h

3x = 10.8 sec x 10km/h = 10.8 sec x10x5/18m/s

3x = 30m

x = 10m.

so,

length of goods train = 10m, and

length of passengers train = 20m