Problem 7 of 22num-007
A cyclist rides at a steady speed of 15 miles per hour. What is this speed in feet per second? (1 mile = 5,280 feet)
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Solution walkthrough1:32
- Two units must change: miles to feet, and hours to seconds. Change one at a time.
- Multiply by feet per mile. Miles cancel, leaving feet per hour.
- One hour is seconds. Multiply by hour per seconds so hours cancel.
- Only feet over seconds is left: feet per second.
- Traps: is feet per hour, is feet per minute, and multiplies by .