Watt, which is a unit of power, is equal a. a joule times a meter b. a joule times a second c. a joule divided by a second d. a joule divided by a meter

A watt is the SI derived-unit for one joule per second, so the correct answer is C. A watt corresponds to the power in an electric circuit in which the potential difference is one volt and the current is one ampere. 

So since the snail is moving at 3.6  miles per hour you multiply by 5280 to change it into feet per hour. so you get 36*528 ft per hour. since there are 3600 seconds in an hour, you divide 36*528 by 3600. so simplifying we get 528/100 which is 5.28 ft per second

From movment law u have this case where: distance d is : d = v*t; v =  velocity; t = time; from here u can extract the time.