how many cubic sugar of edge 20cm can be fitted into cuboid container of dimension 40cm by 60cm by100cm​

Can somebody me out with this question

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

Ineed me i stuck and i don’t want to get it wrong