SOLUTION: 2 cars start at an interstate and travels in the same direction at average speeds of 40 miles per hour and 55 miles per hour. How much time must elapse before the 2 cars are 5 mile

Question 270193: 2 cars start at an interstate and travels in the same direction at average speeds of 40 miles per hour and 55 miles per hour. How much time must elapse before the 2 cars are 5 miles apart?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
This is an RTD problem. Here is a table based on the given information.
cars. . . . . . . . .rate . . . . . . . .time . . . . . . . . . .distance
A. . . . . . . . . . . 40. . . . . . . . . .t. . . . . . . . . . . . . .40t
B . . . . . . . . . . .55. . . . . . . . . .t. . . . . . . . . . . . . .55t
totals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Looking at column 3, we get
55t - 40t = 5
15t = 5
t = 1/3 hr
This is 20 minutes.
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