physics problem?

Question

Given: The energy equivalent of one gallon of gasoline is 1.3 x 10^8 J. A compact car has a mass of 751 kg and its efficiency is rated at 15.8%. (That is 15.8% of the input power available is delivered to the wheels). Find the amount of gasoline used to accelerate the car from rest to 26.7 m/s. Answer in units of gal.

Answer 1

First I think that
F=ma
and work=energy
W=Fs

a= v/t
so
F=m(v/t) and...
What is the time?

If it takes an eternity to accelerate to to this speed that a drop of gas would do just fine.