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https://vle.mathswatch.co.uk/images/questions/question1265.png

 

very confused done some working out  but cant get the hang of it

 Apr 21, 2020
 #1
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AREA of the trapezoid ===     2 m  x  (1.4 + .6)/2 =  2 m^2

VOLUME of the pond = Area of trapezoid by width    = 2 m^2 x 1 m = 2 m^3

 

In 30 minutes volume lost =  .2m x 2 m x 1 m / 30 min  = ..4 m^3 /30 min

 

2 m^3    /  .4 m^3/ 30 min =   150 minutes to completely drain      

 

Question is unclear    :  it will take 150 minutes to completely drain from the start    or    120 from the time 20 cm has drained .

 Apr 21, 2020
edited by ElectricPavlov  Apr 21, 2020

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