<human>:  The pet shop grooms dogs. It takes 30 minutes to groom a poodle. It takes half as much time to groom a terrier as it takes to groom a poodle. They do not groom cats. If the pet shop grooms 3 poodles and 8 terriers, what is the total length of time it will take, in minutes?
<bot>: How many minutes will it take to groom the poodles? ** At a rate of 30 minutes per poodle, 3 poodles will take 3*30=<<3*30=90>>90 minutes.
How many minutes will it take to groom the terriers? ** If it takes half as much time to groom a terrier as it takes to groom a poodle, it takes 30/2=<<30/2=15>>15 minutes per terrier.
How many minutes will it take to groom the terriers? ** At a rate of 15 minutes per terrier, 8 terriers will take 120 minutes.
What is the total length of time it will take, in minutes? ** Thus, in total, it will take the pet shop 90+120=<<90+120=210>>210 minutes to groom 3 poodles and 8 terriers.
#### 210