Among three athletes X, Y and Z, it is known that X runs faster than Y, and Y runs slower than Z. Based on the given information, who is the fastest among the three ?

To determine the fastest athlete, we must analyze the relative speeds provided in the statements:

• Statement 1: X runs faster than Y (X > Y).
• Statement 2: Y runs slower than Z, which implies Z runs faster than Y (Z > Y).

By combining these statements, we establish that both X and Z are faster than Y. However, the data provided does not compare the speeds of X and Z. There are three possibilities: X could be faster than Z, Z could be faster than X, or X and Z could have the same speed.

Because there is no information to establish a definitive ranking between X and Z, it is impossible to conclude who is the fastest among the three. Therefore, the correct answer is Cannot be concluded.