Mathematics, 19.02.2021 19:30 Madisonk2980
Marcelo jogs at a speed of 7 miles per hour when there are no hills. He plans to jog up a mountain road which will cause his speed to decrease by r miles per hour. Which of the following expressions represents the time, t, in hours it will take him to jog 13 miles up the mountain road?
a. t=13/7r
b. t=7+r/13
c. t=13-r/7
d. t=13/7+r
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