Question 910719
let speed of train be x
let distance be y

time taken = y/x=7

speed increased by 10 km/h

(x+10)

time = y/(x+10)

y/x - y/(x+10) =1

7-y/(x+10)=1

y/(x+10)= 6

y=6x+60

but y=7x

7x=6x+60

x=60 distance between two stations