Premise: "A dirt bike rider takes a turn wearing his uniform and helmet and riding a bike marked ""1""."
Hypothesis: "A dirt bike rider is wearing a uniform while riding his bike."
Do we know that the hypothesis entailed by the premise? Now, let's be accurate as possible. Some thinking first:
A dirt bike rider takes a turn wearing his uniform and helmet and riding a bike is a rephrasing of a dirt bike rider is wearing a uniform while riding his bike. So, the answer is yes.