Tough and Tricky questions: Word Problems.
It takes Sarah 14 minutes to do one oil change, and it takes Alice 10 minutes. If Sarah and Alice both begin doing oil changes at exactly 9:00 a.m. without pausing, when is the first time at which they will finish changing the oil of a car simultaneously?  Pick
A) 10:00 a.m.  B) 10:42 a.m.  C) 12:00 a.m.  D) 1:00 p.m.  E) 2:00 p.m.
LCM of 1014   10 = 2 * 5   14 = 2 * 7   LCM = 2 * 5 * 7= 
<gadget id="calculator">2 * 5 * 7</gadget>
<output>70</output>
70= 1 hour 10 minutes   1010AM   10:42 a.m.
<result>B</result>
Tough and Tricky questions: Word Problems.
It takes Sarah 14 minutes to do one oil change, and it takes Alice 10 minutes. If Sarah and Alice both begin doing oil changes at exactly 9:00 a.m. without pausing, when is the first time at which they will finish changing the oil of a car simultaneously?