Consider the following premises. If Jessica drives a car, then Robert is fast. If Jessica were a mechanic, then Robert is fast. For all x_3, x_3 will drive a car. Can we infer the following from them? Robert is fast.
 From the fact that for all x_3, x_3 will drive a car we can infer that for all x_3, x_3 will drive a car or x_3 is a mechanic. From the fact that for all x_3, x_3 will drive a car or x_3 is a mechanic we can infer that Jessica is driving a car or Jessica is a mechanic. Finally, from the fact that if Jessica drives a car, then Robert is fast, that if Jessica were a mechanic, then Robert is fast, and that Jessica is driving a car or Jessica is a mechanic we can infer that Robert is fast. Therefore, the answer is yes.