1.	A person biking uphill travels 15 miles in 1hour. The same person biking downhill travels 15 miles in hour. Find this person's average speed.
		A.	15 mph	B.	22.5 mph
		C.	20 mph	D.	30 mph
		Hint
	2.	Two trains leave the station at the same time. The first train is traveling north at 55 mph and the second train is traveling south at 35 mph. How long does it take until they are 45 miles apart?
		A.	hour	B.	hour
		C.	hour	D.	1 hour
		Hint
	3.	A chemistry experiment calls for a 25% solution of copper sulfate. Juanita has 20 milliliters of 15% solution. How many milliliters of 35% solution should she add to obtain the required 25% solution?
		A.	20 milliliters	B.	15 milliliters
		C.	23 milliliters	D.	17 milliliters
		Hint
	4.	Hakan has 50 milliliters of a 10% acid solution. How many milliliters of 45% acid solution should he add to create a 35% acid solution?
		A.	100 milliliters	B.	97 milliliters
		C.	78 milliliters	D.	125 milliliters
		Hint
	5.	Xenxang drove 60 miles to visit his daughter. On the way to his daughter's house the trip took 1 hour and 15 minutes. On the way back from his daughter's house the trip took 1 hour and 30 minutes. Rounded to the nearest mile per hour, what was Xenxang's average speed for the round trip?
		A.	40 miles per hour
		B.	46 miles per hour
		C.	44 miles per hour
		D.	48 miles per hour
		Hint