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Both A and B in the 400-meter circular track with starting running simultaneously, if in the same di

prettily and Yan Zi Bing2010-03-24 15:10:27 +0000 #1

c275641672010-03-24 15:25:14 +0000 #2
A set of speed is X

200X +400 = 7 * 200

X = 5 Therefore, A's speed is 5 meters per second
slient lonely2010-03-24 15:33:30 +0000 #3
200 seconds to catch up with a description rings a number of run 400 meters. So the race two meters per second, Bi Jia. Therefore, A's speed is 5 meters per second

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