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Average is a casual word . You need to know the MEAN Mean = {10+12+14+16)/4 mean = 52/4 mean = 13 The answer!!!!
Too many unknown variables to answer !... We would need to know such things as the price of the fuel, the average speed and the mpg of the vehicle !
If you know average speed then you cannot determine the acceleration: the very nature of being a average hides all the increases and decreases in speed which are the accelerations (technically, acceleration is change of speed in a direction). All average speed tells you is the constant speed at which you require to travel to cover the given distance in the given time; as the speed is constant, the acceleration is zero.
You first need to know what your average speed is to determine how many miles have been traveled
If you tell people something on a need-to-know basis, you only tell them the facts they need to know at the time they need to know them, and nothing more.