Question 232879: Pairs of markings a set distance apart are made on highways so that police can detect drivers exceeding the speed limit. Over a fixed distance, the speed R varies inversely with the time T. In one particular pair of markings, R is 45 mph when T is 6 seconds. Find the speed of a care that travels the given distance in 5 seconds.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Over a fixed distance, the speed R varies inversely with the time T. In one particular pair of markings, R is 45 mph when T is 6 seconds. Find the speed of a car that travels the given distance in 5 seconds.
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R = k[1/T]
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Find "k":
45 = k[1/6]
k = 260
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R = 260[1/T]
Find the speed of a car that travels the given distance in 5 seconds.
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R = 260/5
R = 52 mph
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Cheers,
Stan H.
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