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what is his average jogging speed?

3. James can jog twice as fast as he can walk. He was able to jog the first 9 miles to his grandmother’s house, but then he tired and walked the remaining 1.5 miles. If the total trip took 2 hours, then what was his average jogging speed?

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David W. | I'll help you understand math!I'll help you understand math!
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2(j + j/2) = 10.5
3j/2 = 21
3j = 42
j = 14 mph