The Student Room Group

mathswatch help

Unsure how to approach this question. Could use some help please. :smile:
Reply 1
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?
Reply 2
This is what I got to so far
But it's only 2 marks
Reply 3
Looks like your volume calculation is wrong or your time subtract at the end.
(edited 4 years ago)
Instead of doing 120-30 you had to add them together 120+30 = 150
150 is your answer

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