starwarsfan123
contestada

Bob is taking his son to look at colleges. The first college they plan to visit is 150 miles from their home. In the first hour they drive at a rate of 60 mph. If they want to reach their destination in 2 1/2 hours. what speed must they average for the remainder of their trip?

Respuesta :

Let's find the remaining distance they must travel.

Total distance-distance covered
150-60=90 mi

Now, we need to find the average speed they need to travel per hour to reach the destination in 2.5 (2 1/2) hours.

90 mi/2.5 h=36 mi/h

They must travel at an average speed of 36mph to reach their destination in 2 1/2 hours.

Check:
60+36(2.5)
=120 mi

Answer:

150 -60 = 90

2.5 hrs - 1 hr = 1.5

So 90÷1.5= 60mph

Step-by-step explanation:

rate = (150-60*1)/(2.5-1) = 90/1.5 = 90/(3/2) = 60 mph