very very very urgent...
Asked by anju.b.thomas | 22nd Dec, 2009, 08:05: AM
Let the distance from his place to school be x m.
Time required to reach school = x/20
Time required for return trip = x/30
Average speed = total distance/total time.
= 2x/(x/20 + x/30)
= 2/(1/20 + 1/30) = 24 km/hr.
Answered by | 22nd Dec, 2009, 11:26: AM
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