Kieran is traveling from city a to city b. as the accompanying map indicates, kieran could drive directly from a to b along county route 21 at an average speed of 55 miles per hour or travel on the interstates, 45 miles along i-85 and 20 miles along i-64. the two interstates intersect at an angle of 150° at c and have a speed limit of 65 miles per hour. how much time will kieran save by traveling along the interstates at an average speed of 65 miles per hour? express your answer in decimal form, rounded to the nearest hundredth of an hour.