SOLUTION: A driver moving at a constant speed sees a log in the road, but it takes time for her to react. During the reaction time, the car keeps going at the same speed. The distance the

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: A driver moving at a constant speed sees a log in the road, but it takes time for her to react. During the reaction time, the car keeps going at the same speed. The distance the       Log On

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Question 390391: A driver moving at a constant speed sees a log in the road, but it takes time for her to react. During the reaction time, the car keeps going at the same speed. The distance the car travels before the driver breaks is the reaction distance. At 75 miles/hour, the reaction distance is 165 feet. What is the reaction time in seconds?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
d+=+r%2At
t+=+d%2Fr
given:
d+=+165 ft
r+=+75 mi/hr
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r+=+75 mi/hr x 1%2F3600 hr/sec = .020833 mi/sec
r+=+.020833 mi/sec x 5280 ft/mi = 110 ft/sec
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165+=+110%2At ft
t+=+165%2F110
t+=+1.5 sec