Joan and her brother Justin left a hotel at the same time, driving in opposite directions at constant rates. After traveling for 4 hours, they were 480 miles apart. If Justin drove 10 miles per hour faster than Joan, how fast did Joan drive?
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Answer:
480 is the correct answer ....
Step-by-step explanation:
Let x = Joan's speed
4x + 4(x+10) = 480
Solve for x.
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