A runner runs 2.5 km in 9 min and then

A runner runs 2.5 km in 9 min and then

A runner runs 2.5 km in 9 min and then takes 30 min to walk back to the starting point.
(a) What is the runner’s average velocity for the first 9 min?
(b) What is the average velocity for the time spent walking?
(c) What is the average velocity for the whole trip?
(d) What is the average speed for the whole trip?
Take the direction of running as the positive direction.

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