-
fleischwolf
- Newbie | Next Rank: 10 Posts
- Posts: 3
- Joined: Wed Jan 21, 2009 1:40 pm
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Machines X and Y produced identical bottles at different constant rates. Machine X, operating alone for 4 hours, filled part of a production lot; then machine Y, operating alone for 3 hours, filled the rest of this lot. How many hours would it have taken machine X operating alone to fill the entire production lot?
(1) Machine X produced 30 bottles per minute.
(2) Machine X produced twice as many bottles in 4 hours as machine Y produced in 3 hours.
The Answer is B
I'm actually able to solve such problems. However, I need lots of time. Is there an easy rule, how much information you need to solve rate problems? I kind of start in the following way and write down all information I have (including relationships between rate,time, amout produced of X and Y).
Machine X
Rate X
Amout produced X
Time X
Machine Y
Rate Y
Amount produced Y
Time Y
How much information, in general, do I need?
(1) Machine X produced 30 bottles per minute.
(2) Machine X produced twice as many bottles in 4 hours as machine Y produced in 3 hours.
The Answer is B
I'm actually able to solve such problems. However, I need lots of time. Is there an easy rule, how much information you need to solve rate problems? I kind of start in the following way and write down all information I have (including relationships between rate,time, amout produced of X and Y).
Machine X
Rate X
Amout produced X
Time X
Machine Y
Rate Y
Amount produced Y
Time Y
How much information, in general, do I need?
