<PRE><B>Question 1189809</B>
Michelle and Thea are running in the Fun Run. Michelle runs at 7 kph and Thea at 5 kph.
 If they start at the same time, how long will it be before Michelle is one-forth kilometer ahead of Thea?
:
let t = time (in hours) from start when M is 1/4 min ahead of T
:
Write a dist equation
7t - 5t = 1/4
2t = 1/4
divide both sides by 2
t = 1/8 hrs, change to minutes, 1/8 * 60 = 7.5 min</PRE>