# Precalculus homework help?

A ferris wheel is a circle with diameter 140 feet which sits on a 6-foot-tall platform making its overall height 146 feet. It completes two revolutions in 2 minutes and 57 seconds. Assuming the riders are at the edge of the circle, how fast are they traveling in miles per hour?

### 2 Answers

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- DWReadLv 74 years ago
circumference = 140π ft

2 rev × (140π ft)/rev = 280π ft

passengers travel 280π ft every two revolutions

2 minutes and 57 seconds = 177 seconds

(280π ft)/(177 seconds) × (1 mile)/(5280 ft) × (3600 seconds)/hour ≅ (3.388 miles)/hour

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