Since 1 liter is equivalent to 1000cm, you can convert the total amount of water in the container and get 2500[tex]cm^{3} [/tex] of water. since V=l*w*h or B*h, you can plug in 15cm and 25cm as well as the volume to get 2500=15*25*h, or 375*h. Dividing 2500 by 375 gives the height, of 6 2/3 cm or 20/3cm.