Leo: Premise: "The bike and the boy jumped over the mound of dirt."
Hypothesis: "A boy is on a dirt course doing jumps on his bike."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:
Jumping over a mound of dirt does not imply that the jump was done on a dirt course.
Thus, the answer is it is not possible to tell.