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Answers by Mark M.

r = d / t rAllen = 15 / (11/12)        55 minutes is 11/12 of an hour rAllen = 16.3636...   As to Molly, without knowing what distance she rode, nothing can be determined. Check the accuracy of your data.  

d = r · t dgoing = (r + 6)(13/60) dreturning = (52/60)r   (r + 6)(13/60) = (52/60)r   Can you solve for r and answer?