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If a boy walks from his house to school at 4 km/hr, he is 23 minutes late. If he walks at 5 km/hr, he is 34 minutes early. What is the distance from his house to school?
If a boy walks from his house to school at 4 km/hr, he is 7 minutes late. If he walks at 5 km/hr, he is 17 minutes early. What is the distance from his house to school?
Walking at 6/7 of his usual speed, a man is 3 minutes late. What is his usual time to cover the distance?