SOLUTION: Could you please help me with this word problem. Science and medicine. Alkaid, the most distant star in the Big Dipper, is 2.1 X 10^18 m from the Earth. Approximately how long do

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Could you please help me with this word problem. Science and medicine. Alkaid, the most distant star in the Big Dipper, is 2.1 X 10^18 m from the Earth. Approximately how long do      Log On

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Question 99513: Could you please help me with this word problem.
Science and medicine. Alkaid, the most distant star in the Big Dipper, is
2.1 X 10^18 m from the Earth. Approximately how long does it take light to travel from Alkaid to the Earth?
Thank you
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
c=3X10^8 m/sec ... (2.1X10^18 m)/(3X10^8 m/sec)=7X10^9 sec

(60sec/min)(60min/hr)(24hr/day)(365day/yr)=3.16X10^7 sec/yr

(7X10^9 sec)/(3.16X10^7 sec/yr)=2.22X10^2 yr