Help me pls this is really hard

Question

Two cyclists are 7 miles apart when they begin biking away from each other in opposite directions. The speed of the first cyclist is 12 miles per hour. The speed of the second cyclist is b miles per hour greater than the speed of the first cyclist.

Answer 1

7 mile apart when they head off in opposite directions

1st goes 12 mph, 2nd goes b mph faster = 12+b mph

in one hour they are 7+12+12+b = 31+b miles apart

in x hours they are 7 +24x + bx miles apart