While reading a book Sarah notices that she has read 3 pages after 10 minutes. If she keeps reading at this rate, how many pages will she have read in 1 hour?

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.