this is thermodynamics ans it uses the otto cycle from the second question downwards - also the first question is 21m/s but what is the calculation

During an experiment in the laboratory, a ten cylinder, four stroke spark ignition engine with a bore of 85.5mm shows that the shaft speed is 7000rpm. The stroke of the engine is 0.09m, and the calorific power is 45M/kg. Determine: i. The average speed of the piston. ii. The thermal efficiency of the cycle for volumetric compression ratio of 3.4 . [5 marks] iii. The real work obtained through the cycle (assume both real and mechanical efficiencies equal to 0.7 , and air-to-fuel mass ratio equal to 15 ). [5 marks] iv. The real (or brake) power obtained through the cycle (assume both real and mechanical efficiencies equal to 0.7, and air-to-fuel mass ratio equal to 15). v. The brake specific fuel consumption. vi. The indicated power and the indicated mean pressure. [5 marks] [5 marks] [5 marks]