Hi.. U should do like this
4/5 mile in 50 min
X mile in 60 min
X=5/4 mile
Volume=legnth times width times height
since it is a cube, legnt=width=height so
volume=height^3 or width^3 or legnth ^3 so
height =5 so
5^3=5 times 5 times 5=125 cubic inches
the answer is C
![x^ \frac{m}{n}= \sqrt[n]{x^m}](https://tex.z-dn.net/?f=x%5E%20%5Cfrac%7Bm%7D%7Bn%7D%3D%20%5Csqrt%5Bn%5D%7Bx%5Em%7D%20%20)
![5^ \frac{2}{5}= \sqrt[5]{5^2}= \sqrt[5]{25}](https://tex.z-dn.net/?f=5%5E%20%5Cfrac%7B2%7D%7B5%7D%3D%20%5Csqrt%5B5%5D%7B5%5E2%7D%3D%20%5Csqrt%5B5%5D%7B25%7D%20%20)
