Help me please .

B

Step-by-step explanation:

This is a rate question. Normally the rate question is for distance, but it can work here. The formula is Distance (D)=Rate(r) times time (t). The "distance" is 150 patio blocks. the rate is p, and the time is h. We are trying to find out how long it will take her to do the patio blocks, and to do that we need to set up a formula, which would be h=. Hope this helps!