What is 19.2×108 minutes in hours?

1.152×107 h

3.200×109 h

3.200×107 h

1.152×1011 h

The answer is:  [C]:  " 3.200 * 10⁷  h " .

Explanation:

19.2 * 10⁸  min * (1 hr / 60 min) ;

=  (19.2 * 10⁸)
;  
         60


Divide EACH SIDE of the fraction by "10" ; to get:


(19.2 * 10⁷)
;  
         6



⇒  (19.2) ÷ (6) = 3.2 ;  so rewrite as:


3.2 *  10⁷ ; which corresponds with:

Answer choice:  [C]:  " 3.200 * 10⁷  h " .

The answers are 20,30,80,180,960,890,1230,4560. on the first row