Need help, not sure on how to work out the total cycling time

Total cycling time = 5 hrs + 19 mins + 18 secs

Step-by-step explanation:

i). Shortest distance cycled = 15.05 miles

ii). Longest time cycled for = 2:09:12 hrs : mins: secs

iii). Time taken by David on 28/04/2018 = 1 hrs + 3 minutes + 25 secs

    Time taken by David on 03/05/2018 = 2 hrs + 6 minutes + 41 secs

    Time taken by David on 08/05/2018 = 2 hrs + 9 minutes + 12 secs

     Total cycling time = (1 + 2 + 2) hrs : (3 + 6 + 9) minutes + (25 + 41 + 12) secs

                                    = 5 hrs + 18 mins + 78 secs

     Since, 78 seconds = 60 secs + 18 secs

                                     = 1 minute + 18 secs

     Therefore, total cycling time = 5 hrs + 19 mins + 18 secs

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below:

a) 0.25x times 3. (could be wrong on equation.)

b) 2.25 pound of dark chocolate. (can i eat all the chocolate? plz? anyway, again, could be wrong, but i hope im right. all the chocolate together should be 5.25 pounds)

have a good day!