26,502.9085923 rounded to the nearest hundredth is 26502.91
Total area of the wall = 28 * 12 = 336 ft²
time = 5 1/4 = 21/4 hours
speed = 336 / 21/4 = 64 ft²/hour
Well lets set up an equation 2 problems per second yields

for every second, x.
Now if we want the problems solved, y it will be equal to this product so

Now lets plug in 60 seconds, which is 1 minute

It can solve 120 algebra problems in 1 minute.

Actually Welcome to the Concept of the Modulus functions.
Since here, the value of h and k are zero,hence
the value of the function f(x) = 3|x| is 3
====> answer is 3