steam engine

In a single acting steam engine, steam is admitted at 15 bar, 200 C and exhausts at 0.75 barwith cut-off occurring at 25% of stroke. Engine produces 150 hp at 240 rpm. The mechanical efficiencyof engine is 85%, diagram factor is 0.7, brake thermal efficiency is 20% and stroke to bore ratio is 1.5.Determine the specific steam consumption and cylinder dimensions. Neglect the cross-section area ofpiston rod and clearance volume