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You can do 420 miles on a tank full. Assuming you start with a full tank of petrol, then you will have to refill after 420 miles, 840 miles, 1,260 miles therefore the answer is three times and you will have a part full tank left. However if you include the initial tank full then the answer is 4 times. Note the answer would be the same all the way up to 1,680 miles when you'd need to fill up again. Also note the speed is a red herring in this question.

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15y ago

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