The salesperson tells Ben that Motorcycle A produces {288}\ \text{ J} 288 J
of kinetic energy and {312}\ \text{ J}
312 J
of heat and sound energy when {600}\ \text{ J}
600 J
of chemical potential energy is supplied to it.
Motorcycle B produces {400}\ \text{ J}
400 J
of kinetic energy and {200}\ \text{ J}
200 J
of heat and sound energy for the same amount of chemical potential energy.

Help Ben decide which motorcycle to buy through calculating the energy efficiency of each of them.