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Sarah's remote control boat can run at a constant rate of 10 feet per second. Her little brother, Danny's boat runs at a constant rate of 5 feet per second. In a race Sarah gives Danny a 4 second head start. How long after Danny's boat takes off will Sarah's boat catch Danny's? Show your work

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jnh008
Roughly 4 seconds after the initial 4 second head start, so she would take 8 seconds to catch up.

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