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carl covers a certain distance by car.he divides the complete distance into four equal parts and after finishing each part he increased his speed to twice the previous one. if, in the first part his speed was 30kmph then what is the average speed of the complete journey?

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assume a project team of 4 students. the project guide had estimated that every one of the students would take approximately 200 working hours to complete the project .but the first two students lagged by 20 hrs each while the last two students completed their tasks 10hours each in advance.by what % is the actual working hours exceed the actual estimation? two people A and B enter a race in which one can run to a point and return back.person A runs at 20 mph to and from the point. person B runs to the point at 10mph and at a 30mph while going back.who came first?