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3.1 minutes

....

56x10^6 miles x (1.61km/ 1 mile) = 9.016x10^7 km away is the closet then...

speed of light, 3.00x10^5 km/second....

(1 second/3.00x10^5 km) * (9.016x10^7 km) = 301 seconds....

...301 seconds * 1 minute/ 60 seconds = 5.02 minutes

...I get 5.02 minutes.

=======================================

Marvelous ! Now we have two answers to the question ... The first contributor

said 3.1 minutes, and the second one said 5.02 minutes. Which one is correct ?

They can't both be right.

Or can they !

Take a look at the ratio of the two answers: 5.02/3.1 = 1.61935... Does that number

look familiar at all ? It should. It's within 0.63% of the number of kilometers in 1 mile.

The first contributor looked at the "56 million" in the question, said to himself

"that must be kilometers", and worked the arithmetic that way.

The second contributor looked at the "56 million" in the question, said to himself

"that must be miles", and worked the arithmetic that way.

It's not too often that you get two wildly different answers to the same question

that are both correct, and you get to choose which one you like. But this is one of

those occasions.

The whole problem goes back to the question, where "56 million" is stated without

units ... a big no-no in just about any subject that involves measurements.

Spacecraft have been lost over sloppy work like that.

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