Question 153613
if a pitcher throws a baseball 90 miles per hour, how many seconds does it take for the ball to reach home plate? 
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Convert miles per hour to feet per second:
[90 miles/1 hour]*[1 hr/3600 seconds]*[5280 ft/1 mile] 

= [90 * 1 * 5280] / [1* 3600 * 1] ft./sec.

= 132 ft./sec
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To cover 60 ft:
(60 ft/132 ft/sec) = 0.454545... seconds
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Cheers,
Stan H.