A girl plants 45 flowers in 30 mins.

Determine the unit rate.

45/30 = 3/2

1.5 flowers per minute

So 45 in 30mins

we ususlly want to make the smallest number equal to one or as close to one as possible so

45/30=3/3 times 15/10

3/3=1

1 times 15/10=15/10

15/10=5/5 times 3/2

5/5=1

1 times 3/2=3/2

3 divided by 2 is 1.5

1.5 flowers per minute