There are 3600 seconds in one hour. Therefore, 2 yards per second is equal to 2 x 3600 = 7200 yards per hour.
There are 1760 yards in one mile. Therefore, 7200 yards per hour is equal to 7200/1760 = 4.09 recurring (that is, 4.090909...) miles per hour.
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At 40 mph you are traveling about 58.667 feet every second.
(miles/hr)*(1/3600)=miles/sec Here is a method to convert units that you can adapt to any conversion: (miles/hr)*(1hr/60min)*(1min/60secs) All I have down here is multiply by fractions that equal 1, except the top and the bottom are in different units. As you can see the hr and min unit drop out and you are left with miles/sec
In 2 seconds at 30 mph (44 ft/s), the distance travelled would be 88 feet. This is calculated by multiplying the speed in feet per second (44 ft/s) by the time in seconds (2 seconds).
1000 yards - or just over 17 miles per hour.
18 feet (3 feet in one yard, 6 yards x 3 feet per yard = 18 feet)