She runs 1/6 mile per minute.
School is 2/3 of a mile away from her home.
Rewrite 2/3 to have the same denominator as 1/6:
2/3 = 4/6
Divide distance by speed:
4/6 / 1/6 = 4/6 x 6/1 = 24/6 = 4
It will take her 4 minutes.
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