A person travels from his house to his off ice by scooter at a speed of 40 km per hour. While returning, he travels at a speed of 20 km per hour. If the distance from his house to office is 5 km, what is his average speed of travelling both ways:

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A person travels from his house to his off ice by scooter at a speed of 40 km per hour. While returning, he travels at a speed of 20 km per hour. If the distance from his house to office is 5 km, what is his average speed of travelling both ways:






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