Question 284235
the distance for both trains is 45 mi
the time for the local train is 1/2 hr longer ___ for the times to be equal, this must be subtracted
the speed of the express is twice the speed of the local


time equals distance divided by rate


45 / 2r = (45 / r) - (1/2)


45 = 90 - r ___ r = 45 (this is the speed of the local train)


2r = 90 (this is the speed of the express train)


the travel time to the "crash" site is 1/2 hr for the express and 1 hr for the local
___ so the crash time is 6:00 pm