There is a single track connecting Pittsburgh to Boston. The length of the track is 478 miles. Train A leaves Pittsburgh at 11:15 am traveling 87 mph. Train V leaves Boston at Noon traveling 99 mph. At what time will they crash? Where will they crash
by noon, A has gone .75*87 = 65.25 miles
That leaves 412.75 miles when V takes off.
Their combined speed is 186 mi/hr
So, it will take 412.75/186 = 2.219 hours
They crash at 2:13:08.4 pm
You can surely figure out where that puts the trains.