smarty5187
30.06.2019 •
Mathematics
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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Ответ:
6 mile/hour
Explanation :
Let the speed of walking of James = x mile/hour
speed of jogging = 2x mile/hour
9/2x + 1.5/x = 2
= > (9 + 3)/2x = 2
= > 12 = 4x
= > x = 3
Average speed of walking = 3 mile/hour
Average speed of jogging = 2 * 3 = 6 mile/hour
Ответ:
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