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?

Solution

Solution

joging speed : 10

Solution steps

Translate the problem into an equation:

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

Solve for

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

joging speed : 10

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