Question 991078
 Car a and car b enter an expressway at the same time and place, and head the same direction.
 Car a travels at70 miles per hour.
 After 2.5 hours, car b is 50 miles behind car a.
 At what speed is car b traveling
:
let b = the speed of car b
:
Write a distance equation; dist = speed*time
:
a's dist - b's dist = 50 mi
2.5(70) - 2.5b = 50
175 - 2.5b = 50
-2.5b  50 - 175
-2.5b = - 125
b = -125/-2.5
b = 50 mph the speed of car b
:
:
See if that checks out
a travels 175 mi
b travels 2.5*50 = 125 mi, difference of 50 mi