If he drives 50 mph and drives for 2 hours he will have gone 100 miles, 3 hours=150 miles, 4 hours=200 miles, 5 hours=250 miles.
If he drives 60 mph and drives for 2 hours he will have gone 120 miles, 3 hours=180 miles, 4 hours=240 miles, 5 hours=300 miles.
How I got the answer,
All you have to do is multiply, 60 mph is exactly that, "MILES PER HOUR" means if they drive 40 mph then in 1 hour they will have gone 40 miles, so if you want to know how many miles compared to hours you have driven, just multiply.
I hope this helps.