you had a similar question the other day.
one rotation would cover 26pi inches.
so in one minute it would cover 506(26pi) inches, or 60(506)26pi inches per hour.
Now how many inches in a mile?
(geesh, I hate this non-metric nonsense)
1 mile = 5280x12 inches
so his rate would be 60(506)26pi/(5280*12) mph
= 39.1 mph which is the same as 12.46pi or answer D
the radius of the tires of a car is 13 inches, and they are revolving at the rate of 506 revolutions per minute. how fast is the car traveling in miles per hour.
A. 6.23pi mph
B. 1.25pi mph
C. 149.50pi mph
D. 12.46pi mph
2 answers
ok thanks alot