Question 13605
speed = distance/time


Jay:
60 = d/t


Now, Lisa starts 6 minutes later which is 1/10 of an hour... as the speed is miles per hour, so any distance must be miles and any time must be hours.


Lisa:
70 = d/(t-1/10)


Now, the question asks where did they meet? That will be where their d values are the same, so


d = 60t and d = 70(t-(1/10)), so


{{{60t = 70(t-(1/10))}}}
60t = 70t-7
10t = 7
t = 7/10 hr
--> t = 42 minutes


so they meet at 2:30 + 0:42 --> 3:12pm.


jon.