Two rainstorms occurred in one week in a certain area. In the first storm, 30ml of rain fell per hour, and in the second storm, 25ml of rain fell per hour. Rain lasted for a total of 35 hours, resulting in a total rainfall of 975ml. How long was each storm?

Question

Two rainstorms occurred in one week in a certain area. In the first storm, 30ml  of rain fell per hour, and in the second storm, 25ml  of rain fell per hour. Rain lasted for a total of 35 hours, resulting in a total rainfall of  975ml. How long was each storm?

anonymous · Answer

messed that up didn't i
put x = hours at 30, 35-x = hours at 25 and solve 
$$30x+25(35-x)=975$$

anonymous · Answer

$$35x+875-25x=975$$
$$5x+875=975$$
$$5x=100$$
$$x=20$$

anonymous · Answer

answer is 20 at 30 ml per hour and therefore 15 at 25ml per hour