8. A boy leaves his house at 9.30 a.m. for his school. The school is 2 km away and classes start at 10.00 a.m. If he walks at a speed of 3 km/h for the first kilometre, at what speed should he walk the second kilometre to reach just in time?
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He should reach the school in half an hour (= 30 minutes). He should travel with speed of 6 km/h to just reach the school on time.
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