Ray and Jane live 150 miles apart, each drives toward the other's house along a straight road connecting the two. Ray at a constant 30 mph, and Jane at a constant 50 mph. If Ray and Jane leave their houses at the same time, how many miles are they from Ray's house when they meet?
I know the answer, I just need an explanation.
The way the book explained it was that by adding up the rates and dividing that in 150, and then multiplying that by Ray's rate. But I don't understand WHY you should add up the rates.
If you can explain that, or give a more lucid explanation that would be perfect.
On another note, does anyone know any websites with good Rates practice problems like this one?