Iii Pool

Iii Pool

anyone tell me how to do this...Junior cert question I had today but couldnt do...:(?

A swimming pool can be filled by a large pipe operating alone in 4 hours.
(i) What fraction of the pool can be filled by this pipe in 1 hour?
The swimming pool can be filled by a small pipe operating alone in x hours.
(ii) Derive an expression in x for the fraction of the pool filled by the two
pipes working together in 1 hour.
It takes 3 hours for the two pipes working together to fill the pool.
(iii) Find x.

OMG weird that's the question I had trouble with!!!!!
Anyway this is what I got:
(i)1/4
(ii)1/4+1/x
(iii)1/4+1/x=1/3 CD=(4)(x)(3)

(4)(x)(3)1/4+(4)(x)(3)1/x=(4)(x)(3)1/3

3x+12=4x

-x=-12

x=12

Hope this helps!!!
would you be able to tell me what you got for your point of intersection of the two lines on Q5 I think.
I got (2.5,8.8)

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Which of these statements regarding dams and reservoirs are FALSE?

i) The flood pool of a reservoir stores any water above the maximum surcharge capacity.

ii) The primary purpose of most dams in the U.S. is flood control.

iii) Dead storage is a storage zone in a reservoir filled with sediments.

iv) Reservoirs are built to alter the timing and magnitude of stream flow to suit demands.

v) Gravity concrete dams account for the majority of dams worldwide.

The last is not true. The majority of dams in the world are earthen dams.

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