Question 968959
26 inch diameter tire
How many revolutions per minute do the tires make when the truck is traveling 55 miles per hour?
I get 711 but the back of the book has 770 I can't tell what I did wrong
:
Let's see what the speed is with 770 rpm
{{{(pi*26*770*60)/(12*5280)}}} = 59.56 mph not 55; the book is wrong,
: 
Try the same equation using 711 for the rpm, you will get 55, or very close