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Five meters per second, Xiao-Hua, Xiao-Ming seven meters per second, Xiao-Hua Primary agree to anyth

Beastmaster 123ASD2010-01-28 22:02:11 +0000 #1
Guiqiu speed
On the next ai baboon2010-01-28 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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