Science connection

Answer 1

Divide 3,660,000,000 miles by 671,000,000 miles/hour = 5.45 hours

Answer 2

Decimal after first number, count digits after decimal, write in notation X.XX x 10^(# of digits).

3,660,000,000 mi

3.66 x 10^9 mi

671,000,000 mi/h

6.71 x 10^8 mi/h

Looking at units, we have mi and mi/h. To find "how long it takes", e.g. time (and by the units it is hours), arrange units to achieve desired answer.

mi h

— X –

m

3.66 x 10^9 mi x (1/6.71 x 10^8 mi/h)

or

3.66 x 10^9 mi / 6.71 x 10^8 mi/h

= 5.45 h