Kanishka walks to school from her home and covers a distance of 3km in 15 mins. She finds out that the school is closed and comes back in 30 minutes. The average speed of Kanishka in the entire journey is * (a) 4Km/hr (b) 8Km/hr (c) 7.5Km/hr (d) 12 Km/hr
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c option is your answer
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