Maths problem on speed, distance and time

Question

It takes Paul 20 minutes to cycle to the cinema from his house. However, on the way back it takes him 25 minutes as he goes 2km/h slower. How far is the cinema from his house?

Needed by Sunday.

Answer 1

20r represents distance going

25(r - 2) represents distance returning

20r = 25(r - 2) the distances are equal

Can you solve for r and answer?