Beth is going 65 miles per hour. Fred is 15 miles behind Beth.
Fred is going 70 miles per hour. How long will it take for
Fred to catch up to Beth?
It's a simple speed and distance problem. The speed is
the difference between the two, i.e, 70mph - 65mph = 5mph
The distance is stated, 15 miles
How long does it take to travel 15 miles at a speed of 5mph?
15mi / 5mph = 3 hrs