SOLUTION: If Amy can run 3.5 miles in 40 minutes, about how many minutes would it take her to run 8 miles at the same rate? Can you please show me the formula to work this out?

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Question 658264: If Amy can run 3.5 miles in 40 minutes, about how many minutes would it take her to run 8 miles at the same rate?
Can you please show me the formula to work this out?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+d+=+r+%2A+t+
+3.5+=+r%2A%28+40%2F60+%29+ ( time in hours )
+r+=+3.5%2A%283%2F2%29+
+r+=+5.25+ mi/hr
--------------
+8+=+5.25%2At+
+t+=+8+%2F+5.25+
+t+=+1.52381+ hrs
+.52381+%2F+60+=+31.4286+
+.4286+%2F+60+=+7.143+
It will take her
1 hr 31 min 7 sec