SOLUTION: Tracy and Klein studied together for the midterm exam. It took them 4 3/4 hours from start to finish during this time they took a half hour break to eat lunch and two more break

Question 1076835: Tracy and Klein studied together for the midterm exam. It took them 4 3/4 hours from start to finish during this time they took a half hour break to eat lunch and two more breaks that were one third of an hour to get snacks what is the best estimate of the time that was spent studying?
Found 2 solutions by Boreal, stanbon:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
4 3/4 -1/2 for lunch=4 1/4
subtract 2(1/3)=2/3 from 4 1/4
Can make it 4 3/12-8/12, using the common denominator of 12. Borrow 5 from 12/12, and it is 3 7/12.
-----------------
Subtracting 2/3 from 4 1/4
Go the other way.
from 2/3 to 1 you need 1/3
From 1 to 4 you need 3
from 4 to 4 1/4 you need 1/4
3 +(1/3)+(1/4)=3 (4/12)+(3/12)=3 (7/12)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Tracy and Klein studied together for the midterm exam. It took them 4 3/4 hours from start to finish during this time they took a half hour break to eat lunch and two more breaks that were one third of an hour to get snacks what is the best estimate of the time that was spent studying?
Ans:: 4 3/4 - [1/2 + 1/3 + 1/3] = 19/4 - (3+2+2)/6 = 19/4-7/6 = (114-28)/24
= 86/24 = 43/12 = 3 7/12 = 3 hrs 35 min
----------
Easier way:: 4hr 45 min - [30 + 20 + 20]min = 3hr 35 min
---------------
Cheers,
Stan H.
RELATED QUESTIONS
Jeff can weed the garden in 4 hours by himself. His wife Brenda takes the same amount of... (answered by nyc_function)
2. The data below are the final exam scores of 10 randomly selected statistics students... (answered by lynnlo)
Time off for lunch. It usually takes Eva 3 hours longer to do the monthly payroll than... (answered by josmiceli)
It usually takes Eva 3 hours longer to do the monthly payroll than it takes Cindy. They... (answered by josmiceli)
It usually takes Eva 3 hours longer to do the monthly payroll than it takes Cindy. They... (answered by DRichardson,stanbon)
I need a bit of help on this one.... It usually takes Eva 3 hours longer to do the... (answered by stanbon,ankor@dixie-net.com)
when he works alone, Brent takes 2 hours longer to buff the gymnasium floor than Tracy... (answered by josgarithmetic,lwsshak3)
I need help with this word problem: Alex can run 26 miles in 6 hours, Bethany can run 26 (answered by ankor@dixie-net.com)
My question is: It usually takes Eva 3 hours longer to do the monthly payroll than it... (answered by ankor@dixie-net.com)