00:01
So a car is moving at a rate of 28 miles per hour.
00:05
And we also know that the diameter of the wheels is two and one third feet.
00:12
But let's change that to seven thirds.
00:15
It's going to be easier to use that in the problem.
00:17
Our first question is find the number of revolutions per minute the wheels are rotating.
00:22
And we're talking about revolutions per minute.
00:24
So i need to change miles per hour into minutes.
00:28
So we're going to take the 28 miles per hour.
00:30
And there are 5 ,280 feet in a mile.
00:36
So let's multiply 28 by 5 ,280 and we get 7 ,840 feet.
00:46
But i also need to know it per minute.
00:49
So i'm going to take that number and i'm going to divide it by 60.
00:53
And that gives me 2 ,464 for that...