Question

A train of length 100 metre crosses another train of length 150 metre, running on a par- allel track in the opposite di- rection in 9 seconds. If the speed of train having length 150 metre is 40 km/hr, then what is the speed (in km/hr) of the other train ?

Answer 1

Answer:

Explanation:

Here relative speed gets into picture

Since the trains towards each other

The relative speed is sum of there speeds.

Speed =d/t

40 KMPH = 40*5/18. =100/9

Now

Relative speed =(length/time)

(100/9)+X = (100+150)/9

X= 150/9 m/s

X= 150*18/5

= 540kmph.