Let the derivative of the function f^1=2x(5-x)(x+3). Find the interval(s) on which f(x) is increasing. The intervals on which f(x) is decreasing (note that I have you derivative of function

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?