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a race car driver drove on a 4km long race course at an average speed of 120km/h for the first 2km. How fast does he have to go the second 2km to average 240km/h for the entire course.
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The question has been closed Mar 14 '12 at 03:00 AM by syclamoth for the following reason:
Question is off-topic or not relevant
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We are not here to do your maths homework.
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