Homework Help: math

Posted by brille on Monday, November 29, 2010 at 8:28pm.

2 rainstorms occurred in one week in a certain area. In the first storm, 15ml of rain fell per hour, and the second storm, 20ml of rain fell per hour.

rain lasted for a total of 40 hours, resulting in a total rainfall of 675ml. how long was each storm

first storm lasted how many hours?=
second storm lasted how many hours?=

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