Help Pleaseeeeeeeee

11 Plus Maths – Preparation and Information

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fluffygirl_27
Posts: 16
Joined: Sun Mar 17, 2019 9:29 pm

Help Pleaseeeeeeeee

Post by fluffygirl_27 »

Can you please help with this question ??


A rectangular container measures 15m long, 9m wide and 6m high . A tap is turned on at a rate of 5m cubed per minute . At the same time the water in the container is released through another tap at a rate of 2m cubed per minute . What will the water level in the container be after 45 minutes??
sunandcloud
Posts: 36
Joined: Tue Nov 17, 2015 4:35 pm

Re: Help Pleaseeeeeeeee ❗️❗️❗️❗️

Post by sunandcloud »

water in: 5m^3/min
water out: 2m^3/min
so water remains 5-2 -> 3m^3/min

after 45mins, water remains 45 x 3 = 135 m^3

The container's volume = 9m x 15m x height (m) =135 m^3

Thus, the water level is 1m high.
fluffygirl_27
Posts: 16
Joined: Sun Mar 17, 2019 9:29 pm

Re: Help Pleaseeeeeeeee ❗️❗️❗️❗️

Post by fluffygirl_27 »

sunandcloud wrote:water in: 5m^3/min
water out: 2m^3/min
so water remains 5-2 -> 3m^3/min

after 45mins, water remains 45 x 3 = 135 m^3

The container's volume = 9m x 15m x height (m) =135 m^3

Thus, the water level is 1m high.



Thank you very much ,makes a lot of sense now❗️❗️
yoyo123
Posts: 8099
Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent

Re: Help Pleaseeeeeeeee

Post by yoyo123 »

I find it always helps to draw diagrams with questions like this.

Look at what information you have (it’s sometimes hidden in the wording) and then use that to find the missing bit.
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