$3.$ Pulverized Fuel Burner Efficiency:

A pulverized fuel burner uses $500$ kg$/$hr of coal with a heating value of $28$ MJ$/$kg$.$ Calculate the power output in MW if the thermal efficiency of the system is $85\%.$

$4.$ Gas Burner Fuel Consumption:

A natural gas burner consumes $150$ m$^3/$hr of gas. Natural gas has a calorific value of $35$ MJ$/$m$^3.$ Calculate the total energy output in MJ$/$hr and convert it to kWh$.$