A runner runs 30 km in a straight line in 90 min and then, Ask an Expert

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A runner runs 3.0 km, in a straight line, in 9.0 min and then takes 25 min to walk back to the starting point. (The running and walking is in a straight line.)

(a) What is the runner's average velocity for the first 9 min? km/h

(b) What is the average velocity for the time spent walking? km/h

(d) What is the average speed for the whole trip? km/h

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