At 9:00 a.m. a truck leaves the truck yard and travels west at a rate of 35 mph. At 11:00 a.m., a second truck leaves along the same route, traveling at 70 mph. When will the second truck catch up to the first?

Question

Quizplus · Accepted Answer

The first truck has a 2-hour head start, traveling 70 miles (35 mph * 2 hours) before the second truck starts. The second truck closes the gap at a rate of 35 mph (70 mph - 35 mph). To cover the 70-mile gap at 35 mph takes 2 hours, so the second truck catches up at 1:00 p.m.

At 9:00 AM