During one minute the metro sells 5 tickets, so they earn 5 * 3 = $<<5*3=15>>15.

So in 6 minutes they would earn 15 * 6 = $<<15*6=90>>90.

# Answer

90
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
One ticket to the underground costs $3. In one minute, the metro sells an average of 5 such tickets. What will be the earnings from the tickets in 6 minutes?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
90
One ticket to the underground costs $3. In one minute, the metro sells an average of 5 such tickets. What will be the earnings from the tickets in 6 minutes?
train