SOLUTION: car and truck leave at noon traveling in opposite directions. truck's speed is 2/3 of the car. at 2:00PM they are 140 miles apart. What is the car's speed?

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Question 640303: car and truck leave at noon traveling in opposite directions. truck's speed is 2/3 of the car. at 2:00PM they are 140 miles apart. What is the car's speed?

Answer by sachi(548) About Me  (Show Source):
You can put this solution on YOUR website!
let the speed of car=x miles/hr
so that of truck =2x/3 miles/hr
in 2 hrs (from noon to 2 pm)
car travels 2x miles & truck 4x/3 miles
both travel in opposite directions
so the distance=2x+4x/3=10x/3=140miles
so x=42 miles/hr=car speed ans