During the first 20 miles of a 50 mile bicycle race, Roger's average speed

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Alexis

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was 16 mi/h. What must his average? During the first 20 miles of a 50 mile bicycle race, Roger's average speed was 16 mi/h. What must his average speed be during the remainder of the race if he is to finish the race in less than 2.5 hours? Greater than:
can somebody solve it ? answer choices
24 mi/h
12 mi/h
8 mi/h
4 mi/h
 
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