Answer:
A child runs 10 feet to the right and then 10 feet to left, and
A rock climber ascends 19 feet and then descends 9 feet,
Explanation:
If a rock climber is climbing 19feet then that person may make a mistake and descend 9 feet.
A child can run 10 feet to the right and 10 feet to the left, showing a matter of speed.