Consider the following premises. Barbara is running if and only if Linda is fast. Linda is fast or Barbara is not running. Can we infer the following from them? If Barbara goes running, then Linda is fast.
 From the fact that Barbara is running if and only if Linda is fast we can infer that if Linda were fast, then Barbara is running. Finally, from the fact that Linda is fast or Barbara is not running we can infer that if Barbara goes running, then Linda is fast. Therefore, the answer is yes.