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3.  Abdul, while driving to school, computes the average speed for his trip to be 20 km  h - 1 . On his return trip along the same route, there is less traffic and the average speed is 40 km  h - 1 . What is the average speed for Abdul's trip ? 

Dear student,time taken in going to school=D20time taken while returning=D40avg speed for the whole trip=2DD20+D40=2D×403D=26.66km/hRegards

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