4. If it takes 4 hours to cover x miles and 5 hours to cover y miles, what is the average speed?
b) x/4 + y/5
d) 4/x + 5/y
5. 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?
4. Answer: C
Because from the condition, 4+5=9 hours can cover x+y ...
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