Problem: Two rainstorms occurred in one week in a certain area. In the first storm 30 ml of rain fell per hour, and in the second storm 20 ml of rain fell per hour. Rain fell that week for a total of 35 hours for a total rainfall of 900 ml. How long was each storm?
Let the first storm be for x hours and the second for y hours. By data, we ...
This solution is comprised of a neat and step-by-step response which illustrates how to construct different equations and then use the technique of simultaneous equations by substitution to solve.