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**Alan306090** 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?