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Five meters per second, Xiao-Hua, Xiao-Ming seven meters per second, Xiao-Hua Primary agree to anyth
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Beastmaster 123ASD
2010-01-28 22:02:11 +0000
#1
Guiqiu speed
On the next ai baboon
2010-01-28 22:07:49 +0000
#2
located at the same time start x seconds to catch up with Xiao-Ming Xiao-hua
is
5x + 20 = 7x
2x = 20
x = 10 (seconds)
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