SOLUTION: Bob, driving a new Ford, travels 330 miles in the same amount of time it takes John, driving an old Chevy and traveling 10 miles per hour faster, to travel 390 miles. How fast is J
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Question 308064: Bob, driving a new Ford, travels 330 miles in the same amount of time it takes John, driving an old Chevy and traveling 10 miles per hour faster, to travel 390 miles. How fast is John driving?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
times are equal ___ t = d / r
330 / j = 390 / (j + 10)
"cross" multiplying ___ 330j + 3300 = 390j
3300 = 60j ___ 55 = j
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