SOLUTION: A truck and a car leave the same intersection traveling in the same direction. The truck is traveling at 35mph and the car is traveling at 42mph. At what time will they be 9 mi apa

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A truck and a car leave the same intersection traveling in the same direction. The truck is traveling at 35mph and the car is traveling at 42mph. At what time will they be 9 mi apa      Log On


   

Question 1125288: A truck and a car leave the same intersection traveling in the same direction. The truck is traveling at 35mph and the car is traveling at 42mph. At what time will they be 9 mi apart.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Separation speed is 42-35=7, miles per hour.

Rate is Distance divided by Time.
R=D%2FT
RT=D
T=D%2FR

when 9 miles apart?
D=9 and R=7

9%2F7

1%262%2F7

1 hour 17 minutes