<PRE><B>Question 278560</B>
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
{{{4/2}}} = 2 sandwiches per minute
:
Find number minutes to make 400 sandwiches
{{{400/2}}} = 200 minutes
:
Change minutes to hrs
{{{200/60}}} = 3{{{1/3}}} hrs or 3 hrs 20 min
:
Find the time
12 - 3{{{1/3}}} = 8{{{2/3}}} 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</PRE>