A semi-truck of mass 20,000 lb accelerates from 0 to 75 mph (1 mph = 0.447 m/s)

Question:

A semi-truck of mass 20,000 lb accelerates from 0 to 75 mph (1 mph = 0.447 m/s) in 10 seconds.
(a) What is the change in kinetic energy of the truck in 10 seconds?
(b) If PE and U of the truck can be assumed constant, what is the average value of dE/dt of the truck during this period?
(c) If 30% of the heat released from the combustion of diesel (heating value of diesel is 40 MJ/kg) is converted to kinetic energy, determine the average rate of fuel consumption in kg/s.