The Flintstones and Rubbles decide to try out the new inclined bowling alley, ``Bedslant Bowling''. Betty's ball and Wilma's ball have the same size, but Wilma's ball is hollow. Fred's ball and Barney's ball are scaled down versions of Betty's ball and Wilma's ball respectively. They all place their bowling balls on the same pitch incline and release them from rest at the same time. Answer choices are (greater than, less than or equal to)
a) The time it takes for Wilma's ball to hit the pins is that for Barney's ball to hit.
b) The time it takes for Barney's ball to hit the pins is that for Fred's ball to hit.
c) The time it takes for Betty's ball to hit the pins is that for Fred's ball to hit.
d) The time it takes for Betty's ball to hit the pins is that for Barney's ball to hit.
e) The time it takes for Fred's ball to hit the pins is that for Wilma's ball to hit.
f) The time it takes for Wilma's ball to hit the pins is that for Betty's ball to hit.