Maurice drove 400 km from Edmonton to Battleford in 1 hour less time than it took Martin to drive the same route from Battleford to Edmonton. If Maurice drove 20 km/h faster than Martin, at what speed did each of them drive?

Show a complete algebraic solution.

This is the equation that I came up with, but I need another one. Can you please help?

Maurice=C
Martin=N

C=400/(20+N)