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28 Jul 2017, 08:48
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D
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Difficulty:
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Charlie takes 2.5 hours to fly from Los Angeles to Mexico City, a distance of 1200 miles. What is the average speed of his plane in miles per hour?
(A) 200 mph
(B) 240 mph
(C) 410 mph
(D) 480 mph
(E) 533 mph
(A) 200 mph
(B) 240 mph
(C) 410 mph
(D) 480 mph
(E) 533 mph
28 Jul 2017, 11:54
Kudos
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Direct substitution into the formula
Speed = Distance/Time taken = \(\frac{1200 miles}{2.5 hour}\) = 480 mph(Option D)
Speed = Distance/Time taken = \(\frac{1200 miles}{2.5 hour}\) = 480 mph(Option D)
15 Oct 2018, 22:59
Kudos
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Hi All,
We're told that Charlie takes 2.5 hours to fly from Los Angeles to Mexico City, which is a total distance of 1200 miles. We're asked for the average speed of his plane in miles per hour. This is a straight-forward 'Average Speed' question, so we can just plug in the numbers at get the answer. There is a minor math move that you can make to save you some effort though...
Total Distance = (Av. Sp.)(Total Time)
1200 = (Av.Sp.)(2.5 hours)
1200/2.5 = Av.Sp.
At this point, instead of dividing 1200 by 2.5, you might find it useful to multiply both the numerator and denominator by 2 (to get rid of the decimal point):
2400/5 = Av.Sp.
480 = Av.Sp.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
We're told that Charlie takes 2.5 hours to fly from Los Angeles to Mexico City, which is a total distance of 1200 miles. We're asked for the average speed of his plane in miles per hour. This is a straight-forward 'Average Speed' question, so we can just plug in the numbers at get the answer. There is a minor math move that you can make to save you some effort though...
Total Distance = (Av. Sp.)(Total Time)
1200 = (Av.Sp.)(2.5 hours)
1200/2.5 = Av.Sp.
At this point, instead of dividing 1200 by 2.5, you might find it useful to multiply both the numerator and denominator by 2 (to get rid of the decimal point):
2400/5 = Av.Sp.
480 = Av.Sp.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
