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. For one particular pair of markings, R is 60 mph when T is 8 seconds. Find the speed of a care that travels the given distance in 6 seconds.

Answer 1

R = k(1/T) = k/T
when R = 60, T = 8
60 = k/8
k = 480

R = 480/T

so when T = 6
R = 480/6 = 80 mph

Answer 2

Fuartbart

Answer 3

aries inversely with the time T. In one particular pair of​ markings, R is 45 mph when T is 9 seconds. Find the speed of a car that travels the given distance in 7 seconds