# math

posted by
**brille**
.

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?=