What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If it is cloudy, then it is sunny. John is taking a plane. Linda is fast. If it is sunny, then Linda is not fast.
It is not sunny can be inferred via the modus tollens rule. John is taking a plane and Linda is fast can be inferred via the conjunction rule. Linda is fast and John is taking a plane can be inferred via the conjunction rule.