Question

Answer it ....as fast as possible!!!​

Answer 1

Answer:

the speed of the train = 60 km /hr

Explanation:

the speed of train in first 30 km is 30km /hr

so the taken = 1hr

the speed of train in next 30km be X km/hr

so time taken = 30/x

the average = 40 km/hr

so, 60 / {1+(30/x) }=40

or 1+(30 /x ) =3/2

or, 30/x = 3/2-1

or, 30/x = 1/2

or, x = 60