Problema Solution
Pairs of markings, a set distance apart, are made on highways so that police can detect drivers exceeding speed limits. Over a fixed distance, the speed R varies inversely with the time T. For one particular pair of markings, R is 48 MPH when T is 9 seconds. Find the of the car that travels the given distance in 8 seconds.
Answer provided by our tutors
R = k[1/T]
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Find "k":
48 = k[1/9]
k = 432
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R = 432[1/T]
Find the speed of a car that travels the given distance in 8 seconds.
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R = 432/5
R = 54 mph