A wheel on a certain machine makes 6 turns every 30 seconds. How many turns does it make in two hours? Think carefully first, then make a decision:
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Since there are 60 seconds in 1 minute, then there are 60 / 30 = 2 sets of 30 seconds in a minute. So a wheel makes 6 x 2 = 12 turns in 1 minute. Since there are 60 minutes in 1 hour, then a wheel makes 12 x 60 = 720 turns in an hour. Therefore, the wheel makes 720 x 2 = 1440 turns in 2 hours. So, the answer is 1440.
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