Manuel and DeAndre both leave the library at the same time, but in opposite directions. If Manuel travels 5 mph and Deandre travels 11 mph how long until they are 128 miles apart

Answer 1

Their speed away from each other equals the sum of their speeds since they are traveling in opposite directions.

5 mph + 11 mph = 16 mph

Distance = Rate * Time, so

Time = Distance / Rate

Time = 128 miles / 16 mph

Time = 8 hours

Answer 2

I hope this helps!