SOLUTION: Sandys average driving speed is 16 miles per hours faster than Andy's . In the same length of time it takes sandy to drive 290 miles, andy only drives 210 miles. What is Sandys ave

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Question 533351: Sandys average driving speed is 16 miles per hours faster than Andy's . In the same length of time it takes sandy to drive 290 miles, andy only drives 210 miles. What is Sandys average speed? Please help! I've done this so many ways and I still can't figure it out!
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
t = d / r ___ the times are equal

290 / s = 210 / (s - 16)

"cross" multiplying ___ 290(s - 16) = 210s ___ 290s - 4640 = 210s