A cylinder of 150mm diameter & 200mm height is to be cast with out any riser. The cylinder is moulded entirely in the drag of a green sand flask & is top gated. The cope of the flask is 200mm height & the height of the metal during pouring is 50mm above the cope. A tapered sprue is employed & he gating ratio is 1:1:5:2. The time taken (in seconds) to fill the casting cavity neglecting energy losses, if the in-gate area is 400sq.mm.