Question 1005925
If in three hours the faster car is 18 miles ahead, then it reasons that it goes 6 miles per hour faster (6*3 = 18 miles).
The slower car travels 150 miles in 3 hours, so its speed is
r = d/t = 150 miles / 3 hours = 50 miles per hour
The faster car is then traveling at 56 miles per hour.