exam Maths Puzzle Numerical Ability

A plane which can fly 100 miles an hour in still air can fly 500 miles with a wind which is blowing at a certain rate in 5/8 of the time it would require to fly 500 miles against a wind blowing at the same rate. What was the rate of the wind?

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I don't recall learning this and I have finals coming up - please help.

The function h(x) was used to generate the following code:
63,18,60,63,30,60,48,69,18,57
Decode this me 5= - square root of 7y-3.