At a fair, you see a huge Ferris wheel. There are ten seats on the wheel, with two people placed on each seat. Every minute, a seat passes by the exit platform. The Ferris wheel opened for 30 minutes at 11 a.m and doubled its speed after fifteen minutes. How many people rode the wheel during this time?
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You go to a Halloween fair with a big Ferris wheel. The wheel has ten seats, and two people are placed on each seat. Every minute a seat passes by the exit platform. At 11 a.m. the Ferris wheel opens for 30 minutes. After fifteen minutes, the wheel doubles its speed - how many people have ridden the wheel during this time ?
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