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The Earth travels around the Sun at an approximate speed of 20 miles p
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02 Dec 2014, 09:14
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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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02 Dec 2014, 10:09
This is a dimensional analysis or unitconverting 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 elseso do this step first.



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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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02 Dec 2014, 20:15
Answer = E) 120,000 1 Km = 0.6 Miles 20 Miles = \(\frac{20}{0.6}\) Kms Km/Hr speed \(= \frac{20}{0.6} * 60 * 60 = 200 * 10 * 60 = 120000\)
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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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03 Dec 2014, 07:58



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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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09 Dec 2014, 05:59
1km=(6/10) mile hence 1 mile=(1km/(6/10))=(10/6)mile. Now Sun speed for an hour is equal to 3600 (number of seconds in an hour)*20 = 72 000 mile. To convert to km simply multiply this by (10/6). Hence (72 000 * 10)/6 = 12 000*10=120000. Hope it is clear
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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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09 Dec 2014, 21:42
1 hour = 3600 sec
20*3600=72000m/h
1/0.6=10/6 km in 1 mile
10/6*72000=120,000
E



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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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29 Nov 2015, 11:45
20miles/sec * 60sec/min * 60min/h = 72,000 miles / hour
now, 72,000 miles/hour * 10km/6miles simplify miles with miles, 6 with 72, and get 12,000 * 10km/hour => 120,000.00 km



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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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02 Apr 2016, 12:37
To calculate the equivalent of kilometres in a mile 20 miles = 20*(0.6)^1 = 33.3334 kilometres In 1 hour there are 60 minutes In 1 minute there are 60 seconds So in 1 hour there are 3600 seconds Speed in kmph = 33.3334 * 3600 = 120000
Correct answer  E



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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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02 Sep 2017, 05:07
This question can be solved by unitary method 0.6 miles =1 km So 20 miles =? Number of kilometers = 20/0.6=200/6 Now to convert Seconds into hours we have to divide the second by 3600 So the speed will be =200/6*3600=12000 Hence E
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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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07 Mar 2019, 20:52
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Re: The Earth travels around the Sun at an approximate speed of 20 miles p
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