Answer:
25%
Step-by-step explanation:

Subtract the numbers :


Cancel the common factor : 2

hope this helps!.
(W-3)(w+3)
——————-
(w-7)(w+3)
There is 3600 seconds per hour.
Multiply the speed per second by 3600 to get the speed in miles per hour then convert to kilometer/hour.
4.9 * 3600 = 17,640 miles per hour
17,640 x 1.6 = 28,224 kilometers per hour