SOLUTION: 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

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Question 540666: 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?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
His time for the 1st 20 miles was
+20+=+16%2At+
+t+=+1.25+ hrs
He needs to finish in less than
+2.5+-+1.25+=+1.25+ hrs
also
+50+-+20+=+30+ mi
---------------
+v+=+30%2F1.25+
+v+=+24+
His speed must be greater than 24 mi/hr