SOLUTION: two trucks start from the same point at the same time and go in opposite directions. One truck travels at 88 km/h and the other truck travels at 72 km/h. How long must they travel

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Question 285110: two trucks start from the same point at the same time and go in opposite directions. One truck travels at 88 km/h and the other truck travels at 72 km/h. How long must they travel to be at least 672 km apart
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
88*x+72*x=672
(88+72)*x=672
160x=672
x=4.2 hours