What is the source of the input energy for the cogeneration of energy?

Well it depends.
 For example a saltwater distillation process requires heat that turns the saltwater into steam - the steam runs through a condensor to produce drinkable water. However, that same steam could also be used to drive a steam turbine to generate electricity, before being condensed back into water. 

The source of the original heat may have been coal, oil, gas, or other fuel. But now you've gained maximum benefit from the same heat unit.
XD :)

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.