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Machine A takes twice as much time as machine B to make N

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Machine A takes twice as much time as machine B to make N [#permalink] New post 09 Oct 2003, 22:28
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Machine A takes twice as much time as machine B to make N items.
Working together at their respective rates, A and B can make 5 items
in 3 days. How many days will A take to produce 2 items


i get 3 1/3 days

thanks
praetorian
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 [#permalink] New post 13 Oct 2003, 06:21
Thats what I got Praet
B = 2A
Therefpre A + B= 3A
If 3A can make 5 items in 3 days
3A can make 1 item in 3/5 days
A can make 1 item in 9/5 days
A can make 2 items in 18/5 days

thats 3.6 days

cheers
neeraj
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Re: PS : Work [#permalink] New post 13 Oct 2003, 07:04
praetorian123 wrote:
Machine A takes twice as much time as machine B to make N items.
Working together at their respective rates, A and B can make 5 items
in 3 days. How many days will A take to produce 2 items


i get 3 1/3 days

thanks
praetorian


A classic formuls is Work=Rate*Time

rate A = x
rate B = 2x

(x+2x)*3=5, where x=5/9
rate A = x = 5/9

2=rateA*T
T=2/rate A=2/5/9=18/5=3 and 3/5 day.
Re: PS : Work   [#permalink] 13 Oct 2003, 07:04
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