How can you find the problem of 6.25/5

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

Solve the equation for b: a= (1/2)(b)(h)