SOLUTION: Truck is driving 60mph a car leaves 7 minutes later going 72mph how long before the car catches the truck

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Question 415413: Truck is driving 60mph a car leaves 7 minutes later going 72mph how long before the car catches the truck
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
60 mi/hr = 1 mile/minute
The truck is 7 miles ahead (1*7)
The car "gains on" the truck at 12 mph (72 - 60)
It'll take 7/12 hours = 35 minutes
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PS "gains on" is a common term, but it's better to consider a different frame of reference.
The speed of the car relative to the truck is 12 mi/hr is a better perspective.