Aman goes from his home to his office at a speed of 30 m/s and returns at 50% more speed. If the distance between his home and office is 1,800 metres, then find the average speed of the entire journey.
The speed by which the man returns to his home from his office = 1.5 x 30 = 45 m/s Time taken by the man to reach his office = (1800/30) = 60 seconds Time taken by the man to return to his home from office = (1800/45) = 40 seconds Average speed = [(Total distance) /(Total time) ] = [(2 x 1800) /(60 + 40) ] = (3600/100) = 36 m/s
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