Answer :
It was rounding to the nearest THOUSAND.
We are looking at the thousands place, keep that in mind.
Remember: everything 5 and above is rounded up, everything below 5 is rounded down.
186,789 is above 500, it is rounded to 187,000
186,899 is above 500, it is rounded to 187,000
185,990 is above 500, it is rounded to 186,000
and 185,190 is below 500, it is rounded to 185,000
Only one matches the criteria of the question:
185,990 is above 500, it is rounded to 186,000
therefore the answer is 185,990 miles per second
Have a fantastic day!
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