Answer:
I think it's measure of distance.
let me know if that is right
17 x 8 = (10 +7) x 8
17 x 8 = (10 x 8) + (8 x 7)
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Distance traveled in 3 hrs was (speed in mph)(3 hrs)
Then s(3 hrs) + 12 mi = 132 mi.
Therefore, 3s = 120, and s = 120 miles / 3 hrs = 40 mph (answer)
