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

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