Question 1195535
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Observe that his riding speed of 28.8km/hr is exactly 3 times his running speed of 9.6km/hr.  Since the distances to and from school are the same, he spent 3 times as long running as riding.<br>
Then, since the total time was 20 minutes, he spent 15 minutes (1/4 hour) running and 5 minutes (1/12 hour) riding.<br>
So the distance between his home and school is (1/4)(9.6) = 2.4km, or (1/12)(28.8) = 2.4km.<br>