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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?
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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?
If a boy walks from his house to school at 5 km/hr, he is 20 minutes late. If he walks at 6 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 3 km/hr, he is 9 minutes late. If he walks at 4 km/hr, he is 26 minutes early. What is the distance from his house to school?
A car travels from A to B at 20 km/hr and returns from B to A at 30 km/hr. What is the average speed for the whole journey?