Answer:
Yes: 75 cm > 68 cm
Explanation:
It's partially done, but you can find a diagonal, which is the longest length from one point of the rectangle to the other. That can be found by the pythagorean theorem
a = 45 cm, b = 60 cm, c = ?
a² + b² = c²
45² + 60² = c²
c² = 5625
c = 75 cm
So, yes, a skateboard that is 68 cm can fit in the box, because the diagonal id longer.