Asatellite can move at 17,000 miles per hour. how many hours will it take to reach a star that is three light years away? recall that 1 light year = 9.5 ∙ 1012 kilometers and 1 kilometer = 0.62 miles. show your work.

First convert the distance to miles 

9.5 × 10^12 km x 0.62 miles/km 
= (0.62 × 9.5) x 10^12 miles 
= 5.9 × 10^12 miles 

 we want to triple that, because it is 3 light years (not just 1): 
3 x 5.9 × 10^12 miles 
≈ 18 × 10^12 miles 
≈ 1.8 × 10^13 miles 

Next divide by the speed to get the time (in hours). 
t = 1.8 × 10^13 miles / 17000 miles/hour 

convert the speed to scientific notation: 
t = 1.8 × 10^13 / 1.7 x 10^4 

t = (1.8 / 1.7) × (10^13 / 10^4) <-- when dividing powers with the same base, subtract the exponents 
t ≈ 1.1 × 10^9 

convert that back to standard notation. 

 
1,100,000,000 hours (P.S. That is about 120,000 years).
Hope this helps!!!

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