Question

water is pouring into a conical vessel of a diameter 5.2 M and slant height is 6.8 metres @ 1.8 metre cube per minute how long will it take to fill the vessel

Answer 1

V = (1/3)pi*r^2*h
slant height s=6.8 m
r = 5.2/2 = 2.6 m
h = √(s^2 - r^2) = √(6.8^2 - 2.6^2) = 6.283 m.

V = (1/3)pi * 2.6^2 * 6.283 = 44.48 m^3

so if the fill rate is 1.8 m^3 then the 
reservoir will be filled in 44.48/1.8 = 24.7 or 25 minutes.

hope it helps
mark as brainliest if useful