A cylinder of 150 mm diameter & 200 mm height is to be cast without any riser. The cylinder is moulded entirely in drag of a green sand flask & is top gated. The cope of flask is 200 mm height & the height of metal pouring is 50 mm above the cope. A tapered sprue is employed & the gating ratio is 1 : 1.5 : 2. The time taken _________ (in seconds) to fill the casting cavity neglecting energy losses, if the ingate area is 400 sq-mm.