Cole drove from home to work at an average speed of 75 kmh. He then returned home at an average speed of 105 kmh. If the round trip took a total of 6 hours, how many minutes did it take Cole to drive to work? Choose the correct choice from the following answers:	A) 84	B) 136	C) 172	D) 210	E) 478
First round distance travelled (say) = d   Speed = 75 k/h   Time taken, T2 = d/75 hr   Second round distance traveled = d (same distance)   Speed = 105 k/h   Time taken, T2 = d/105 hr   Total time taken = 6 hrs   Therefore , 6 = d/75 + d/105   LCM of 75 and 105 = 525   6= d/75 + d/105   =&gt; 6 = 7d/525 + 5d/525   =&gt; d = 525 / 2 Km   Therefore, T1= d/75   =&gt; T1 = 525 / (2 x 75)   =&gt; T1 = (7 x 60) / 2 -- in minutes   =&gt; T1 = 210 minutes.   210
<result>D</result>
Cole drove from home to work at an average speed of 75 kmh. He then returned home at an average speed of 105 kmh. If the round trip took a total of 6 hours, how many minutes did it take Cole to drive to work?