Question

A truck going 50 miles per hour

set out on a 200-mile delivery at 6:00 A.M.
Exactly half an hour later, a car left from
the same place and traveled in the same
direction as the truck. What was the speed
of the car, in miles per hour, if it caught up
to the truck at 8:00 A.M.? Round your
answer to the nearest tenth.

Answer 1

133.33 mph

Explanation:

The small trick is to notice the time. Is it 8:00 AM the same day. We don't know, but we will assume it is.

So the truck was on the road for 2 hours.

The car was on the road for 2 - 1/2 = 1 1/2 = 1.5 hours.

The distance travelled was 200 miles

Solution

d = r * t

200 = r * 1.5

200/1.5 = r

r = 133.33 miles / hour

The noise you hear is a siren trying to catch up to the car.