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You are to drive for an exam in another ...

You are to drive for an exam in another town, at a distance of 300 km on an expressway. The exam begins at 11:15 am. You plan to drive at 100 km/h, so you leave at 8:00 am to allow for some extra time. You drive at that speed for first 100 km but due to some construction work you have to move with 40 km/h for 40 km. What is the least speed needed for the rest of the trip to arrive in time for the exam?

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