2. It takes Prof. Jones 2 hours to drive 120 miles from West Lafayette to Chicago. If it takes an additional 4 hours for him to drive 160 miles from
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2. It takes Prof. Jones 2 hours to drive 120 miles from West Lafayette to
Chicago. If it takes an additional 4 hours for him to drive 160 miles from
Chicago to Waupun WI, what is his average speed for the entire trip?
(a) 50 mi/h
(b) 46.7 mi/h
(c) 66.7 mi/h
(d) 60 mi/h
(e) 40 mi/h
3. Prof. Jones leaves West Lafayette at 8:00 am and drives north 175 km to
South Bend, then 140 km to Kokomo and then drives 75 miles back to West
Lafayette, where he arrives at 5:00 pm. At the end of the day, what is Prof.
Jones' total displacement?
(a) 390 km
(b) 130 km
(c) Ojkm (d) 12 m/s (e) not enough information

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