Work out the total volume
* area of the trapezium multiplied by width
Work out the volume water goes down in 20 mins
* this is at the top of the shape, so its just a cuboid with the given depth
Divide the two volumes and multipy by 20 mins to get the total time.
Which bits are you having trouble with?
* area of the trapezium multiplied by width
Work out the volume water goes down in 20 mins
* this is at the top of the shape, so its just a cuboid with the given depth
Divide the two volumes and multipy by 20 mins to get the total time.
Which bits are you having trouble with?
Instead of doing 120-30 you had to add them together 120+30 = 150
150 is your answer
150 is your answer
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