Consider the following premises. There is at least one x_7 for which x_7 is fast or x_7 is not rich. For all x_7, x_7 is rich and x_7 is a taxi driver. Can we infer the following from them? There is at least one x_7 for which x_7 is fast.
 From the fact that there is at least one x_7 for which x_7 is fast or x_7 is not rich we can infer that there is at least one x_7 for which if x_7 were rich, then x_7 is fast. From the fact that for all x_7, x_7 is rich and x_7 is a taxi driver we can infer that for all x_7, x_7 is rich. Finally, from the fact that there is at least one x_7 for which if x_7 were rich, then x_7 is fast, and that for all x_7, x_7 is rich we can infer that there is at least one x_7 for which x_7 is fast. Therefore, the answer is yes.