A man has to go 10 km to catch a bus. He walks part of the way at 7 km/hr and runs the rest of the way at 12 km/hr. If he takes 1 hour 15 minutes to complete his journey, find how far he walked.

If mx+ny=12 my, then x/y +n/m =

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Hashem wants to put up fencing around three sides of his rectangular yard and leave a side of 20 feet unfenced...