(centimeter/minute): 17
(miles per hour): 0.00633799
Volume = Length × Breadth × Height
So you are absolutely right, it is 252 yards squared
109.8
you take 240 and subtract that from 2/5.Then you subtract 20 and that gives you 219.6.Since they have the same amount of marbles left,you have to divide 219.6 by 2 and your answer is 109.8
(I just used a calculator)