Yesterday it took a certain plane 3 hrs. to fly from City A to City B at an average of 400 mph. Today the same plane flew from City A to City B at an average speed of 450 mph. How many more yesterday than it took today?*I didn't understand this part*
i think it is pretty straight though the last part of the question is unclear/
= 3 hours - 1200/450
= 20 minuets.
Yeah the answer is C.. I just wasn't sure what GMAT meant by the last part..
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