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Complete Question
Peyton is a sprinter who can run the 40-yard dash in 4.5 seconds. He converts his speed into miles per hour, as shown below.
Which ratio is incorrectly written?
40 yd/4.5 sec • 3 ft/1 yd • 5280ft/1 mile • 60 sec/1 min • 60 min/1 hr
Answer:
5280ft/1 mile is the incorrect ratio
Hence, 40-yard dash in 4.5 seconds = 18.2 miles per hour(mile/hr)
Step-by-step explanation:
We are to convert 40 yards per 45 seconds to Mile per hour.
We are given the following conversion ratios:
40 yd/4.5 sec • 3 ft/1 yd • 5280ft/1 mile • 60 sec/1 min • 60 min/1 hr
The incorrect ratio is 5280ft/1 mile .
It should have been written as 1 mile/5280 ft.
Hence,
40 yd/4.5 sec • 3 ft/1 yd • 1 mile/5280ft• 60 sec/1 min • 60 min/1 hr
= 432000mile/23700 hr
= 18.181818182 mile/hr
Approximately= 18.2mile/hr
