Answer:
Step-by-step explanation:
You want the upper and lower bounds for speed, given that distance 160 was traveled in time 7.2 (both to 2 significant figures).
As the problem statement tells you, speed is proportional to distance and inversely proportional to time.
The upper bound for speed will be the upper bound for distance divided by the lower bound for time.
165/7.15 ≈ 23.1 . . . . . speed units (maximum)
The lower bound will be the lower bound for distance divided by the upper bound for time.
155/7.25 ≈ 21.4 . . . . . speed units (minimum)
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Additional comment
Dividing the nominal values, the nominal speed is 22.22... speed units. Rounded to 2 sf, this would be 22 speed units. The implied bounds are 22±0.5. You can see that the upper and lower bounds computed here are actually about 22.25±0.85.
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