This is a model of 63÷6. :)
(343.98)x400,000/(413.4)
137,592,000/413.4
332,830.188679
Answer: 144 inches.
Step-by-step explanation:
1. To solve this problem you must remember the formula for calculate the perimeter of a rectangle, which is shown below:

Where
is the lenght and
is the width.
2. You know the perimeter and the width, then you can solve for the length, as following:

5.3/8.8=x/14.3
AB is x,
x= 2.43
Hope I helped.