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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?
A car travels from A to B at 20 km/hr and returns from B to A at 80 km/hr. What is the average speed for the whole journey?
A car travels from A to B at 15 km/hr and returns from B to A at 30 km/hr. What is the average speed for the whole journey?
Walking at 5/6 of his usual speed, a man is 8 minutes late. What is his usual time to cover the distance?