If he gathers for 2 hours, the number of minutes gathering is 2 * 60 minutes per hour = <<2*60=120>>120 minutes of gathering flowers

Gathering for 120 minutes / 10 minutes per flower = <<120/10=12>>12 flowers gathered

If he gathers 12 flowers initially but lost 3, he has 12-3 = <<12-3=9>>9 flowers gathered and kept

Since he has 30 classmates total and has 9 flowers, he needs to gather 30-9=<<30-9=21>>21 more flowers

Assuming it takes 10 minutes per flower, it will take him 10 * 21 = <<10*21=210>>210 minutes to gather the remaining 21 flowers needed

# Answer

210
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Justin needs to collect one flower for each classmate that is in his 2nd-grade class. It takes him on average 10 minutes to find a flower he likes. He has been gathering for 2 hours. Assuming he has lost 3 of the flowers he initially gathered, how many more minutes does he need to look if he has 30 classmates?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
210
Justin needs to collect one flower for each classmate that is in his 2nd-grade class. It takes him on average 10 minutes to find a flower he likes. He has been gathering for 2 hours. Assuming he has lost 3 of the flowers he initially gathered, how many more minutes does he need to look if he has 30 classmates?
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