Question

Two boys who live 14 miles apart start at noon to walk toward each other at rates of 3 mph and 4 mph respectively. In how many hours will they meet?

1 hr
2 hr
3 hr

Answer 1

Okay so basically let's focus on their walking.
After one hour, one guy has walked 3mi and the other 4mi, which is in total 7
After 2 hours, one guy has walked 6mi and the other 8mi, which is 14mi

So if we do it algebraically this is how we would do it:
3x +4x = 14 *x being the hour
7x = 14
x =2