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A, has two long-distance running, a speed of 6 m per second, has a speed of 4 meters per second, has

〖〗 Fifi Snow2010-01-29 03:02:07 +0000 #1

b have 8 loves2010-01-29 03:18:19 +0000 #2
50 seconds please?

100 / (6-4) = 50 A
ice fox ink ink2010-01-29 03:17:04 +0000 #3
100 / (6-4) = 50 seconds
545,454 Bang Bang Tang2010-01-29 04:18:52 +0000 #4
100 / (6-4)
niuxiaokede2010-01-29 04:40:14 +0000 #5
A set X seconds to catch up with B

because the B in the A before the 100 meters, so B would like to add .100

6X = 4X +100

solution x = 50 so 50 seconds after the A to catch up with B

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