Problema Solution
At a NASCAR racetrack, the distance per lap is 2 miles. Lou drives his car at a constant rate of 160 miles per hour. Ralph drives his car at a constant rate of 170 miles per hour. How long will it take before Ralph gains 2 laps in relation to Lou?
Answer provided by our tutors
distance per lap = 2 miles
Lou
rate = 160
Ralph
rate = 170
x/160 = (x+4)/170
let x = distance traveled
solve for x
170x= 160x+640
10x = 640
x= 64 miles
time = 64/160 = 0.40 hours = 24 minutes