Number, NAP-K4-CA31 A grain silo is in the shape of a cylinder. The silo has a diameter of 10 metres. Grain is poured into an empty silo at a rate of 4 cubic metres per minute. Approximately how long will it take to completely fill the silo? `1 3/4\ text(hours)` `2 1/2\ text(hours)` `4\ text(hours)` `16\ text(hours)` Show Answers Only `4\ text(hours)` Show Worked Solution `text(Volume of cylinder)` `= pi xx r^2 xx h` `= pi xx 5^2 xx 12` `~~ 942\ text(m³)` `:.\ text(Time to fill silo)` `~~ 942 ÷ 4` `~~ 235\ text(mins)` `~~ 4\ text(hours)`