Description
Michael is a sprinter who can run the 50-yd dash in 5.5. sec. he converts his speed into miles per hr, as shown below
50 yds 60 secs 1 hr 3 ft 1 mi
______ X _____ X _____ X ____ X _____
5.5 secs 1 min 60 min 1 yd 5280 ft
which ratio is incorrectly written to coveret his speed
1- 3 ft 1 yd
2- 1 mi 5280 ft
3- 60 sec/1 min
4- 1 hr/60 min
Explanation & Answer
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The answe r is 4. 1 hr/60 min.
This ratio is incorrectly written. It should have been 60 min/ 1 hr. First no. Of yards covered per Second is calculated as 50 yd/5.5 sec.then this number is multiplied by 60 sec/ 1 min to get yd/min. Then to convert yd/min to yd/hr one needs to multiply by the ratio 60 min/1 hr and not 1hr/60 min.
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