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400 meters test, the first of 6 m / s finish most of the journey, after 8 m / sec sprint to the fini

Has been 5 in2010-04-12 08:10:08 +0000 #1

I am a little Cry2010-04-12 08:23:58 +0000 #2
When first run sprint set X m, the meaning of the title was:

X / 8 + (400-X) / 6 = 65

X = 40

40 / 8 = 5 (seconds)

A: The sprint time by 5 seconds.

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