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Henry must travel from A to B and he plans to go at a certain speed

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Henry must travel from A to B and he plans to go at a certain speed. He would like to arrive earlier than planned and notes that travelling at a speed 5 km/h faster than planned he will arrive 5 hours earlier and travelling at a speed 10 km/h faster than planned he will arrive 8 hours earlier. What is his planned speed? A 10 km/h B 15 km/h C 20 km/h D 25 km/h E Impossible to determine