SOLUTION: Mrs. Casey is in charge of making sandwiches in the lunchroom. She can make 4 sandwiches in 2 minutes. One Monday, she must make 400 sandwiches by 12:00 noon. What time does she

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Question 278560: Mrs. Casey is in charge of making sandwiches in the lunchroom. She can make 4 sandwiches in 2 minutes. One Monday, she must make 400 sandwiches by 12:00 noon. What time does she need to start?
Please provide step by step instruction, I am helping my child.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Mrs. Casey is in charge of making sandwiches in the lunchroom.
She can make 4 sandwiches in 2 minutes.
One Monday, she must make 400 sandwiches by 12:00 noon.
What time does she need to start?
:
Find out how many sandwiches per minute
4%2F2 = 2 sandwiches per minute
:
Find number minutes to make 400 sandwiches
400%2F2 = 200 minutes
:
Change minutes to hrs
200%2F60 = 31%2F3 hrs or 3 hrs 20 min
:
Find the time
12 - 31%2F3 = 82%2F3 hrs or 8:40, she needs to start
:
:
You can check this by finding number of minutes from 8:40 to 12:00
3(60) + 20 = 200 min * 2 = 400 sandwiches