A car or train is traveling at 60 mph. If the rate of speed increases 4 mph each hour, how long will it be before the car is traveling at a rate of 80 mph?
It is an easy math question. Lets look the answer together.
A) 4 hours
B) 5 hours
C) 6 hours
D 7 hours​
Solution:
The speed increases 4 mph every hour from 60 to 80.
80 mph – 60 mph = 20 mph.
20 mph / 4 mph = 5 hours 🙂 Answer is B.