Cole drove from home to work at an average speed of 80 kmh. He then returned home at an average speed of 120 kmh. If the round trip took a total of 2 hours, how many minutes did it take Cole to drive to work?
Options
A) 66
B) 70
C) 72
D) 75
E) 78
First round distance travelled (say) = d   Speed = 80 k/h   Time taken, T2 = d/80 hr   Second round distance traveled = d (same distance)   Speed = 120 k/h   Time taken, T2 = d/120 hr   Total time taken = 2 hrs   Therefore , 2 = d/80 + d/120   LCM of 80 and 120 = 240   2= d/80 + d/120   =&gt; 2 = 3d/240 + 2d/240   =&gt; d = 240 * 2/ 5 Km   Therefore, T1= d/80   =&gt; T1 = (240 *2) / (5 x 80)   =&gt; T1 = (6 x 60) / 5 -- in minutes   =&gt; T1 = 72 minutes.   72
<result>C</result>
Cole drove from home to work at an average speed of 80 kmh. He then returned home at an average speed of 120 kmh. If the round trip took a total of 2 hours, how many minutes did it take Cole to drive to work?