Information you should note on how to get this answer:
One foot is a third (1/3) of a yard.
60 seconds are in one minute
60 Minutes are in one hour.
A rate of of 6 feet per second means:
6 ft x 1 yard x 60 seconds x 60 minutes
1 sec 3ft 1 minute 1 hour
When the problem is arranged like this, units cancel, and leaves the rate you are looking for (Yards/Hour)
6 ft x 1 yard x 60 seconds x 60 minutes = 7200yards/hour
1 sec 3ft 1 minute 1 hour
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Since a yard is equal to 3 feet, to convert from yard to feet you have to multiply by 3.
1 yard= 3 feet
3 feet = 1 yard...
Divide by 3.
There are 5,280 feet in a mile. So 90 miles per hour is 475,200 feet per hour. (90 x 5280) 475,200 divided by the 60 minutes in the hour comes out to 7920 feet per minute. Dividing 7920 feet per minute by the sixty seconds in a minute comes to 132 feet per second. This is also, if you are interested, 44 yards per second. (132 feet per second divided by three feet in a yard)