February 2010
Problem of the Month

MPH Problem

A roundtrip from Fort Collins, CO to Lubbock, TX and back to Fort Collins is 1,200 miles.

It took Mr. P and his wife 20 hours for the roundtrip but those 20 hours included their pit stops.

If they stopped for a total of 1 hour 50 minutes, how fast did they average (in mph to the nearest tenth) over the whole trip?

Solution to the Problem:

Mr. P and his wife averaged 66.1 mph.

Subtract 1 hour 50 minutes from 20 hours to get 18 hours 10 minutes.

Divide 1200 by 18 hours 10 minutes (or 18.1666... hours) to get 66.055 mph.

Correctly solved by:

1. John Funk	Ventura, California
2. Hazen Dickerson	Mountain View High School, Mountain View, Wyoming
3. Sierra West	Mountain View High School, Mountain View, Wyoming
4. Tawny Bugas	Mountain View High School, Mountain View, Wyoming
5. Bo Aimone	Mountain View High School, Mountain View, Wyoming
6. Jacob Harmon	Mountain View High School, Mountain View, Wyoming
7. Makayla Wisenbaker	Mountain View High School, Mountain View, Wyoming
8. Michael Black	Mountain View High School, Mountain View, Wyoming
9. Hannah Black	Mountain View High School, Mountain View, Wyoming
10. Austin Hale	Mountain View High School, Mountain View, Wyoming
11. Michael Brown	Mountain View High School, Mountain View, Wyoming
12. David & Judy Dixon	Bennettsville, South Carolina
13. Sam Rho	John Handley High School, Winchester, Virginia

Send any comments or questions to: David Pleacher