Aclassroom has a length of 20 feet and a width of 30 feet. the headmaster decided that tiles will look good in that class. if each tile has a length of 2 ft and a width of 3 ft, how many tiles are needed to fill the classroom

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.