Question

Shanic's car is traveling 10 miles per hour slower than three times the speed of Brandon's car. She covers 93 miles in 1 hour 30 minutes. How fast is Brandon diving?

A. 24 miles per hour
B. 28 miles per hour
C. 32 miles per hour
D. 36 miles per hour

Answer 1

We need to solve this backwards. First, we need to find the rate or speed of Shanic's car, by:
`(93)/(1.5) = 62`. Next, go backwards, add 10 mph to 62 mph - which we got it earlier - and get 72 mph. Then divide 3 - since it said 3 times, and going backward, we divide - which we got earlier and get 24 mph.