SOLUTION: At 9am Rob leaves his house traveling 60mph, Sue leaves the same house 15minutes later traveling 65mph. At what time will Sue catch up to Rob?

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Question 353612: At 9am Rob leaves his house traveling 60mph, Sue leaves the same house 15minutes later traveling 65mph. At what time will Sue catch up to Rob?
Answer by Alan3354(69443) About Me  (Show Source):
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At 9am Rob leaves his house traveling 60mph, Sue leaves the same house 15minutes later traveling 65mph. At what time will Sue catch up to Rob?
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In 15 mins, Rob is 15 miles away.
Sue's speed relative to Rob is 5 mph (65-60)
15 miles/5 mph = 3 hours
9:15 + 3 = 12:15 PM