Solution:
Given that, Total distance covered by Roohi to reach home is 300 km.Let the speed of the train be x km/hr and the speed of the bus is y km/hr.
According to question and using Time=
Thus, Total distance =300 km.Roohi travels 60 km by train and 300−60=240 by bus in 4 minute,
Then,100 km by train, 300−100=200 by bus, and takes 10 minutes more,
Now, let 
Multiply eq1 by 5 and eq2 by 6 we get,
Subtracting eq3 and eq4 we get,
Putting the value of u in eq1 we get:
Now,
Hence, the speed of the train is 60 km/hr and the speed of the bus is 80 km/hr.
