A wheel on a certain machine makes 6 turns every 30 seconds. How many turns does it make in two hours?
Since there are 60 seconds in 1 minute, then there are 60/30 = <T>divide(60, 30)=2.0 sets of 30 seconds in a minute.
So a wheel makes 6 x 2 = <T>multiply(6, 2)=12 turns in 1 minute.
Since there are 60 minutes in 1 hour, then a wheel makes 12 x 60 = <T>multiply(12, 60)=720 turns in an hour.
Therefore, the wheel makes 720 x 2 = <T>multiply(720, 2)=1440 turns in 2 hours.
