We must first convert minutes to hours, so 30 minutes * (1 hour/60 minutes) = <<30*(1/60)=0.5>>0.5 hours

The number of miles Greg travels on his trip home is 0.5 hours * 20 mph = <<0.5*20=10>>10 miles

The total miles Greg travels is 10 + 30 = <<10+30=40>>40 miles

# Answer

40
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Greg drives 30 miles from his workplace to the farmer's market. After buying his groceries at the farmers market, he drives home. To get home, he travels for 30 minutes at 20 miles per hour. How many miles in total does Greg travel?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
40
Greg drives 30 miles from his workplace to the farmer's market. After buying his groceries at the farmers market, he drives home. To get home, he travels for 30 minutes at 20 miles per hour. How many miles in total does Greg travel?
train