Question 423210
Joan is traveling on a bike path at 20 miles per hour. Thirty minutes after she started, Jack follows her at 25 miles per hour. How long does it take Jack to catch up with her?
-----------
In 30 mins, Joan is 10 miles away (20 mph * 0.5 hr)
Jack gains on her at 5 mph (25 - 20)
10 miles/5 mph = 2 hours