Question 50119
To get the distance, you multiply speed by time. So if you let Roman's speed be x, then Phil's speed is x + 20. 1.5 hours has passed. Then Roman has gone 1.5x, and Phil has gone 1.5(x+20). Since they're going in opposite directions, the distance between them is just the sum of their individual distances:

1.5(x + 20) + 1.5x = 168
1.5x + (1.5 * 20) + 1.5x = 168
3x + 30 = 168
3x = 168 - 30
3x = 138
x = 138/3 = 46

Then Roman is going 46 mph, and Phil is going 46 + 20 = 66 mph. Hope that helps!