Problema Solution
bill drives 120 miles from his house in san diego to los angeles for a business meeting. Afterward, he drives from la to las vegas, a distance of 240 miles. if he averages the same speed on both legs of the trip and it takes him 2 hours less to go from san diego to los angeles, what is his average driving speed?
Answer provided by our tutors
let the speed from la to lv = t hrs
distance between s to la is 120 miles
distance between la to lv is 240 miles
now according to question
120/t-2 = 240/t
t = 2t -4
t = 4 hrs
now av.speed = 240 /t = 120/t-2 = 120/4-2 = 120/2 = 60miles/hr