Two trains leave the station at the same time going in opposite directions. ONe train travels at 90 mph and the other is travelling at 120 mph. After how many hours will they be 735 miles apart?

Question

anonymous · Answer

Just add the mph both travel like this

90 + 120 = ? = 210

Then afterwards multiply h (hours) to it and set it to 735

h*210= 735

Where h=hours

Solve for h now

anonymous · Answer

Okay... I am SO confused now. So just add the MPH, which gets to 210, then I'm completely lost.....

anonymous · Answer

how many hours do you multiply 210 mph to get 735 miles?

anonymous · Answer

210 mph means that in 1 hour you travel 210 miles 

How many hours do you need to travel 735 miles?

anonymous · Answer

3 1/2??

anonymous · Answer

I think, because if you multiply 210 times 3 you get 630, however if you multiply it times 4 you get 840.