Colin and Dan are marking exam papers. Each set takes Colin 20 minutes and Dan 1 hour. Express the times Colin and Dan take as a ratio. Give your answer in its simplest form

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'.

your answer is the frist one

hop i

the answer is d

step-by-step explanation: