At the Indianapolis 500 time trials, each car makes four consecutive laps, with

Question

At the Indianapolis 500 time trials, each car makes four consecutive laps, with its overall or average speed determining that car’s place on race day. Each lap covers 2.5 mi (exact). During a practice run, cautiously and gradually taking his car faster and faster, a driver records the following average speeds for each successive lap: 140 mi/h , 170 mi/h , 200 mi/h , 230 mi/h .

His average speed is:

A) Exactly the average of these speeds (185 mi/h).

B) Greater than 185 mi/h.

C)Less than 185 mi/h.

Explain your reasoning. Calculate the car's average speed.

Explanation / Answer

Average speed = total distance / total time

Total distance = 2.5 miles x 4 = 10 miles

total time = 2.5/ 140 + 2.5/ 170 + 2.5 /200 + 2.5/ 230 = 0.0559 hour apprx

averaeg speed= 10/ 0.0559 = 178.89 mil/ hour apprx

C) C)Less than 185 mi/h.

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