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December 20, 2014

December 20, 2014

Posted by **Marie** on Monday, August 29, 2011 at 5:10pm.

- math -
**Mgraph**, Monday, August 29, 2011 at 6:26pmLet the distance to school S, my speed=S/30

the speed of my brother=S/40 and

I catch up with him after t min.

Then

S/40*(t+8)=S/30*t

30t+240=40t

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