I think the surface area would be 148.31mm squared
See the attachment below
Thanks.
You just use what you already know. You know that 1 week is equal to 7 days so you just do 1 * 7 = 7 or 1 week. Then 54 * 7 = 378
The one who walked 1.2 miles would have made $72 and the one who walked 0.8 miles would have made $48.