This questions asks you to find how that how long will it take until to fill the cone if 1,413
of water goes in it every minute.
First, you have to find the volume of the cone:
V = 1/3 r^2 Pi * h
V = 1/3 * 60^2 * 150
V = 1/3 * 36000 * 471
V = 565, 200

If 1,413
of water goes every minute into the cone, you will have to divide the volume by 1413 : 565, 200:1413 = 400
Therefore, it will take 400 minutes.