John can jog twice as fast as he can walk. He was able to jog the first 5 miles to his grandmother's house, but then he tired and walked the remaining 2 miles. If the total trip took 0.9 hours, then what was his 평균 jogging speed?

해법

John can jog twice as fast as he can walk. He was able to jog the first 5 miles to his grandmother's house, but then he tired and walked the remaining 2 miles. If the total trip took 0.9 hours, then what was his average jogging speed?

해법

joging speed : 10

솔루션 단계

Translate the problem into an equation:

\frac{5}{x} + \frac{2 ^{2}}{x} = 0.9

x

해결 대상

, \frac{5}{x} + \frac{2 ^{2}}{x} = 0.9 : x = 10

joging speed : 10

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