1. If it takes 4 hours to cover x miles and 5 hours to cover y miles, what is the average speed?
a) 9
b) x/4 + y/5
c) (x+y)/9
d) 4/x + 5/y
2. If you can make 100 cups of coffee and 125 cups of tea from a gallon milk, how many gallons of milk would you need to make 20 cups of coffee and 25 cups of tea?
a) 0.1
b) 0.2
c) 0.3
d) 0.4