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Updated on: 18 Jul 2008, 08:08
Originally posted by arjtryarjtry on 18 Jul 2008, 06:08.
Last edited by arjtryarjtry on 18 Jul 2008, 08:08, edited 2 times in total.
Last edited by arjtryarjtry on 18 Jul 2008, 08:08, edited 2 times in total.
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working together at their constant rates , A and B can fill an empty tank to capacity in1/2 hr.what is the constant rate of pump B?
1) A's constant rate is 25LTS / min
2) the tanks capacity is 1200 lts.
1) A's constant rate is 25LTS / min
2) the tanks capacity is 1200 lts.
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18 Jul 2008, 06:18
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C
1) we don't know the tanks capacity. We know the speed of a, but we can't figure how quickly A can fill it alone without the capacity.
2) We don't know the speed of either pump. The trick here is to forget the information from (1) and only use the info for (2) otherwise we'll likley answer B, when it should be C.
(Together) We can figure out how quickly A can fill the tank (48 minutes) and then from that we can figure out how fast B must be in order to make A + B = 30 minutes (or 2400 litres an hour)
1) we don't know the tanks capacity. We know the speed of a, but we can't figure how quickly A can fill it alone without the capacity.
2) We don't know the speed of either pump. The trick here is to forget the information from (1) and only use the info for (2) otherwise we'll likley answer B, when it should be C.
(Together) We can figure out how quickly A can fill the tank (48 minutes) and then from that we can figure out how fast B must be in order to make A + B = 30 minutes (or 2400 litres an hour)
arjtryarjtry
18 Jul 2008, 06:30
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arjtryarjtry
C for me
(A+B)* 30 mins = X litres of water...(X)
1) A is 25 Lts/ min, in 1/2 hr A alone will fill the tank with 25 * 30 = 750 ltrs of water
(X) leaves is with 2 unknowns, X and A...insuff
2) (A+B)* 30 mins = 1200 litres of water
A + B = 40 lts/min
two unknowns, A & B, insuff
Together
25 + B = 40
B = 15 lts/min
suff
