Suppose the owner of a vehicle replaces the stock 25.0-in. tires ...

[naturalchemist]

Suppose the owner of a vehicle replaces the stock 25.0-in. tires on a car with 23.5-in. tires. At the same time, the 3.27:1 differential is replaced with a 3:73:1 differential. As a result of these changes, the 24-tooth speedometer gear must be replaced. How many teeth should the new gear have?
 
  What will be an ideal response?

Question 2

A truck is driven on the interstate at a constant speed, as the speedometer reports a speed of 60 MPH. The passenger records a time of exactly 56 seconds between mile markers. Knowing the speedometer is in error, and that the old speedometer gear has 14 teeth, how many teeth should a replacement gear have?
 
  What will be an ideal response?

[Smiles0805]

Answer to Question 1

29 teeth

Answer to Question 2

13 teeth

[naturalchemist]

Thanks for the timely response, appreciate it

[bblaney]

Gracias!