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02 Dec 2014, 09:14
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
67% (01:31) correct
33%
(01:40)
wrong
based on 359
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The Earth travels around the Sun at an approximate speed of 20 miles per second. This speed is how many kilometers per hour? [1km = 0.6 miles]
A) 2,000
B) 12,000
C) 43,200
D) 72,000
E) 120,000
Source: Chili Hot GMAT
A) 2,000
B) 12,000
C) 43,200
D) 72,000
E) 120,000
Source: Chili Hot GMAT
intheend14
02 Dec 2014, 10:09
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This is a dimensional analysis or unit-converting problem. Let's start:
20miles/second to miles/hour: 20mi/s*3600s/hr
miles/hour to kms/hour: 20mi/s*3600s/hr*1km/0.6mi
Doing this cancels out the units of miles (mi) and seconds (s) and yields km/hr and we end up with 120,000km/hr
Choice E
Note that its easier to do 3600s/hr*1km/0.6mi than to multiply anything else--so do this step first.
20miles/second to miles/hour: 20mi/s*3600s/hr
miles/hour to kms/hour: 20mi/s*3600s/hr*1km/0.6mi
Doing this cancels out the units of miles (mi) and seconds (s) and yields km/hr and we end up with 120,000km/hr
Choice E
Note that its easier to do 3600s/hr*1km/0.6mi than to multiply anything else--so do this step first.
02 Dec 2014, 20:15
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Answer = E) 120,000
1 Km = 0.6 Miles
20 Miles = \(\frac{20}{0.6}\) Kms
Km/Hr speed \(= \frac{20}{0.6} * 60 * 60 = 200 * 10 * 60 = 120000\)
1 Km = 0.6 Miles
20 Miles = \(\frac{20}{0.6}\) Kms
Km/Hr speed \(= \frac{20}{0.6} * 60 * 60 = 200 * 10 * 60 = 120000\)
