Scott and Dylan both leave the park at the same time, but in opposite directions. If Scott travels 1

Scott and Dylan both leave the park at the same time, but in opposite directions. If Scott travels 12 mph and Dylan travels 19 mph, how long until they are 186 miles apart?

Hour 1, they are 19 + 12 = 31 miles apart. So each hour, they get 31 miles more apart.

When they are 186 miles apart, we divide this by 31 miles apart per hour:
186/31 = 6 hours