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The Sun is approximately 1,400 million kilometers from the p

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The Sun is approximately 1,400 million kilometers from the p [#permalink] New post 17 Feb 2017, 02:50
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The Sun is approximately 1,400 million kilometers from the planet Saturn, and light from the Sun travels to Saturn at the rate of approximately 300,000 kilometers per second. Approximately how many minutes does it take for light to travel from the Sun to Saturn?

A) 80

B) 130

C) 160

D) 280

E) 360
[Reveal] Spoiler: OA

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Re: The Sun is approximately 1,400 million kilometers from the p [#permalink] New post 17 Feb 2017, 11:38
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Explanation

This is a simple arithmetic problem. We know that \(speed = \frac{Distance}{time}\).

Distance between sun and saturn = 1400 Million Kms = 1,400,000,000.
Speed of light = 300,000 km/sec

So \(time = \frac{Distance}{Speed}\) \(=\frac{1,400,000,000}{300,000}= 4666.66666667\) secs.

or \(4666.66666667\) seconds =\(\frac{4666.66666667}{60}\) minutes \(\approx 77.77\) minutes.

Hence option A is correct.
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Re: The Sun is approximately 1,400 million kilometers from the p [#permalink] New post 29 May 2018, 14:56
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Carcass wrote:


The Sun is approximately 1,400 million kilometers from the planet Saturn, and light from the Sun travels to Saturn at the rate of approximately 300,000 kilometers per second. Approximately how many minutes does it take for light to travel from the Sun to Saturn?

A) 80

B) 130

C) 160

D) 280

E) 360


Since 1 million = 10^6, we can re-express the distance from the Sun to Saturn as 1,400 x 10^6 kilometers. We can also express the light’s rate as 3 x 10^5. The time to travel from the Sun to Saturn, in seconds, is:

(1,400 x 10^6)/(3 x 10^5) = (1,400/3) x 10^1 sec = 14,000/3

In minutes, that is (14,000/3)/60 = 14,000/180 = 1400/18 = 700/9 ≈ 80.

Answer: A
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Re: The Sun is approximately 1,400 million kilometers from the p   [#permalink] 29 May 2018, 14:56
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