John goes from A to B in 10 h and B to A in 8 h. Rate going back was 15 km/h more than going there. How far from A to B?

8 ( x + 15 ) = 10x

8x +120 = 10x

8x + 120 - 10x = 0

- 2x + 120 = 0

- 2x = - 120 ( divide both sides by - 2 )

x = 60