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Together Tim and Alan can unload a truck 8 in minutes When Tim works alone it takes him 12 minutes longer than Alan to unload the truck. How long does it take each person to unlock the truck alone.

Respuesta :

1/8 is Tim and Alan working together, as they unload 1 truck per 8 minutes.
1/x-12 is Tim doing it alone.
1/x is Alan doing it alone.

The equation to solve is:
1/x = 1/x-1  + 1/x

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