Posted by: dynamite February 1, 2011
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total miles to school = 6 miles
his bike speed = 6/.5 = 12
time taken to go to minnies house = 5 /12
total time taken = 3/4
time taken to go to school = 3/4 - 5/12
= 4/12 = 1/3
but speed = distance / time = 1/(1/3) = 3
So he was walking 3 miles per hour.