1) Andy drove 840 miles in 12 hours. How far could he drive in 3 hours? Unit rate (speed)
Distance

2) Pira drives 825 miles to California. The trip takes 17 hours. He uses 38 gallon of gas on the trip, which costs him $125.
Find his speed
Find his gas mileage
Find the unit price he paid for gas.

Step-by-step explanation:

Mr. Anderson drove 168 miles in 3 1/2 hours: d1 = 168 mi  

t1 = 3 1/2 hr

t1 = 3.5 hr

v1 = the first rate

v1 = d1/t1

v1 = 168/3.5

v1 = 48 mph

He then drove 2 1/4 hours at a rate of 5 miles an hour faster than the first rate:

t2 = 2 1/4 hr

t2 = 2.25 hr

v2 = v1 + 5

v2 = 48 + 5

v2 = 53 mph

d2 = the distance

d2 = v2*t2

d2 = 53*2.25

d2 = 119.25 mi

during the total time 3 1/2 + 2 1/4 = 5 3/4 hr Mr. Anderson drove:

d1 + d2 = 168 + 119.25 = 287.25 mi.

Hope that helps :)