Final answer:
Mr. A's work rate is 200 blocks per day and Mr. B's work rate is also 200 blocks per day. Option (b) is the correct answer.
Step-by-step explanation:
To find Mr. A's and Mr. B's respective work rates, we need to calculate how many blocks each can mold per day.
For Mr. A, the rate is calculated by dividing the total number of blocks by the number of days:
Work rate of Mr. A = Total blocks molded / Number of days
= 1000 blocks / 5 days
= 200 blocks/day.
Similarly, we calculate Mr. B's work rate:
Work rate of Mr. B = Total blocks molded / Number of days
= 1200 blocks / 6 days
= 200 blocks/day.
So the correct answer is (b) Mr. A: 200 blocks/day, Mr. B: 200 blocks/day.