Manpreet took part in an inter school race competition. He cycled 2.7 km, ran for 2/3 hours and walked the remaining 500m of the race. If the total distance of the race was 12km, then find her running speed. (a) 13.2 km/hr (b) 12 km/hr (c) 7.5 km/hr (d) 8.8 km/hr

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