A TIRE FOR A COMPACT CAR IS 21 INCHES IN DIAMETER. IF THE CAR IS TRAVELING AT A SPEED OF 80MI/HR, FIND THE NUMBEROF REVOLUTIONS THE TIRE MAKES PER MINUTE

Circumference =Πd

=22/7*21

=66 inches

Speed is 80 miles per hour

In 1 minute the wheel covers

80miles/60 minutes

=1.3333miles per minute

Since 1 mile =63630 inches,

1.3333 miles= 1.3333miles*63360inches

=84480 inches

Revolutions per minute=84480/66

=1280 revolutions

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