Abdul while driving to school computes the average for his route to be 20km/hr. On his return trip along the same route, there is less traffic and his average speed is 30km/hr. What is the average speed for Abdul's trip?
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Step-by-step explanation:
remember average speed=(total distance)/total time
let distance be d and time be t
total distance = d+d =2d
total time = d/20 + d/30 = d/12
average speed= 2d / (d/12) = 24 KMPH
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