The average speed is v=2d/t, where d is the distance to the office, and t is the time of travel to the office and back. The walking speed is v0=5km/hr, and the rickshaw speed is 15km/hr=3v0. Hence, the total travel time is t=d/v0+d/3v0=4d/3v0. From this, we find the average speed: v=2d/t=3v0/2=7.5km/hr.
Answer: 7.5 km/hr
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