Question

A passenger train takes 3 hours less for a journey of 360 km, if its speed is increased by 10  km/hr from its usual speed. What is the usual speed?

Answer 1

Let the usual speed be x km/hr.
Distance covered in the journey = 360 km
Now,

Time is taken by the train with the usual speed

Given that if speed is increased by 10 km/hr, the same train takes 3 hours less.
⇒ Speed of the train = (x + 10) km/hr and time taken by the train after increasing the speed