Abdul while driving to school, computes ...

Abdul while driving to school, computes the average speed for his trip to be `20 kmh^(-1)`. On his returen trip along the same route, there is less traffic and the average speed is `40 kmh^(-1)`. What is the average speed for Abdul's trip ?

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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 30 km h^(-1) . What is the average speed for Abduls trip ?

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