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Two students in the playground to practice long-distance race, a lap with 3min, B lap with 4min, the

Love Violet Fairy2010-01-29 18:01:15 +0000 #1
To formula
betrayer Illidan2010-01-29 18:02:57 +0000 #2
Solution: Let time x min

(1 / 3 + 1 / 4) x = 1

x = 12 / 7

A: 12 / 7 minutes after the phase encounter.

This is the primary problem? As early as the Xia Xie, I forgot. .

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