Need help solving problem

Question

Our galaxy is estimated to be
5.6 × 1019 mi
across. How many years would it take a spaceship traveling at 39,000 mph to cross the galaxy? (Round the decimal value to one decimal place.)

Answer 1

d = r · t

d / r = t

5.6 x 10¹⁹ / 3.9 x 10⁴

1.435897436 x 10¹⁵ hours (get started now!)