Designed for elementary and middle school students	Math Trip   The Math Team in Addville traveled to Subtractville for a math competition.  The bus averaged 40 mph from Addville to Subtractville but averaged 60 mph during the return trip.  What was the average speed of the bus for the entire trip?
February 20, 2006
Past Problems
	E-mail Solutions to: brainteaser@umassd.edu
	Names will only be posted for students in elementary and middle school
	Correct Solutions
	David Shi. JLS Middle School, Palo Alto, CA Anna Shang. Balboa Middle School, Ventura, CA Brady Wern. Monticello Middle School, Monticello, MN Zhuxinyu Gu. 62th Middle School, Shanghai, China Sahit Bollineni. Highmeadow Common Campus, Farmington Hills, MI Becca Neeland. Pembroke Intermediate School, Corfu, NY Van Vo. Sacred Heart School, Melrose Park, IL Aude Lefranc. Homeschooled, Minnetonka, MN Brian Chan. Summit Middle School, Coquitlam, BC, Canada Phillip Ai. Hammarksjold Middle School, East Brunswick, NJ Mridul Singh. K.V. Happy Valley, Shllong, India Karinna Loo. Marengo Elementary, South Pasadena, CA Ben Hiller. Brunson Elementary, Winston-Salem, NC Matthew DeCoste. La Canada Middle School, La Canada, CA Kathleen DeCoste. La Canada Elementary, La Canada, CA Sahana Vasudevan. Vargas Elementary School, Sunnyvale, CA Vicky Enouiti. Valencia, Kissimmee, FL Aaron Prince. McKinley Elementary School, Tulsa, OK David Lu. P.S.139Q, New York City, NY Akhil Jariwala. Hunter Elementary School, Raleigh, NC Shivam Sarodia. Normandy Elementary, Centerville, OH Albert Zhou. Scott Middle School, Lincoln, NE
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 Last Updated On: 2/28/06