Question 207415
 Sue heads due west from Dry Gulch on U.S. 65 at a steady speed of 55 mph (miles per hour) while Don heads due east from Wet Hollow (which is 840 miles west of Dry Gulch) on the same hi-way at 65 mph both start at the same time. After what time did they cross paths.
I would like this solved with respect to time. That is Time traveled by Don to crossing point is equal to time traveled by Sue to crossing point.
Time Traveled (Don) = Time Traveled (Sue). I can solve it by using Dist traveled but would like to see this worked out via time if it can be.
--------------
They're approaching, so their speeds are added.  55+65 = 120 mph.
840/120 = 7 hours.
-----------------
s = 65 mph (Sue's speed)
n = 55 mph (Don's speed)
d = rt
65t + 55t = 840
120t = 840
t = 7 hours