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23 Jun 2016, 02:05
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (00:53) correct
12%
(00:53)
wrong
based on 216
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A spaceship in orbit rotates around the planet Pluto. How many full rotations can the spaceship complete in 20 hours?
(1) The radius of the rotation is 21,000 miles.
(2) The spaceship travels at 35 miles per second.
(1) The radius of the rotation is 21,000 miles.
(2) The spaceship travels at 35 miles per second.
23 Jun 2016, 03:32
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Bunuel
Required: How many full rotations around Pluto in 20 hours.
To calculate the number of rotations, we need the distance covered in each rotation and the speed of the spaceship.
Statement 1: The radius of the rotation is 21,000 miles
No information about the speed.
INSUFFICIENT
Statement 2: The spaceship travels at 35 miles per second.
No information about the distance.
INSUFFICIENT
Combining both statements:
We have information about the speed and the distance.
Hence we can calculate the number of rotations in 20 hours.
SUFFICIENT
NOTE: You do not need to calculate the exact valuer.
COrrect Option: C
23 Jun 2016, 05:14
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Bunuel
Statement 1)
Radius of rotation = 21,000 miles
Distance traveled to complete one rotation = 2 x pie x r = 2 x 3.14 x 21,000
As no info with regard to speed of rotation is given .. Insufficient Rule out Choice A) & D)
Statement 2)
Speed of Spaceship = 35 miles/ sec = (35x60x60)/hour
As no info with regard to distance is given .. Insufficient Rule out Choice B)
Statement 1) & 2) combined
Distance traveled in 20hours = 35x60x60x20
=> No of rotations complete = (35x60x60x20)/(2x3.14x21000) = 19.10 [in the test there is no requirement to actually solve the calculation]
The question specifically asks for no. of full rotations
Hence ans = 19 .. Sufficient
Answer Choice C) is correct.
Good luck
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