<PRE><B>Question 777491</B>
A car leaves a town at 100 kilometers per hour. How long will it take a second car, travelling at 115 kilometers per hour, to catch the first car if it leaves 1 hour later?
--------
1st Car DATA::
rate = 100 km/hr ; time = x hrs ; distance = 100x km
---------------------
2nd Car DATA:
rate = 115 km/hr ; time = x-1 hrs ; distance = 115x-115 km
---------------------
Equation:
distance = distance
100x = 115x-115
5x = 115
x = 23 hours 
x-1 = 22 hours (time for 2nd car to catch 1st)
==================
Cheers,
Stan H.
==================</PRE>