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20 Aug 2020, 00:17
Kudos
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Speed: 100 feet in 2 seconds.
Desired speed: Miles per hour
1 mile = 5280 feet
=>1 feet = \(\frac{1 }{ 5280}\) mile
=>100 feet = \(\frac{100 }{ 5280}\) mile
1 hour = 3600 seconds
=>1 second = \(\frac{1 }{ 3600}\) hour
=>2 seconds = \(\frac{2 }{ 3600}\) hour
Desired speed: Miles per hour
=> \(\frac{100 }{ 5280}\) * \(\frac{3600 }{ 2}\)
=> 34.09
Answer C
Desired speed: Miles per hour
1 mile = 5280 feet
=>1 feet = \(\frac{1 }{ 5280}\) mile
=>100 feet = \(\frac{100 }{ 5280}\) mile
1 hour = 3600 seconds
=>1 second = \(\frac{1 }{ 3600}\) hour
=>2 seconds = \(\frac{2 }{ 3600}\) hour
Desired speed: Miles per hour
=> \(\frac{100 }{ 5280}\) * \(\frac{3600 }{ 2}\)
=> 34.09
Answer C
06 May 2021, 19:42
Kudos
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gmatser1
Since it is an approximation problem (it says 'approximate' in the problem), you will first notice that the answer choices are spread far apart so that allows you to approximate quite aggressively.
(50*3600)/5280 is approximately (50/5000) * 3600 = slightly smaller than 1/100 * 3600 = slightly smaller than 36. The only answer choice that is slightly less than 36 is 34. Answer is (C).
28 Jul 2023, 16:58
Kudos
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100ft in mile
100/5280
2 seconds to hour
2/3600
Therefore miles per hour
100/5280 x 3600/2
375/11
34
GMAT quant instructor Lagos Nigeria
Posted from my mobile device
100/5280
2 seconds to hour
2/3600
Therefore miles per hour
100/5280 x 3600/2
375/11
34
GMAT quant instructor Lagos Nigeria
Posted from my mobile device
