Water level

To cuoid shaped poll, bottom size 2m and 3.5m; flows water at a rate of 50 liters per minute.
How long will take to water reach level 50 cm?

Correct result:

t =  70 min


a=2 10=20 dm b=3.5 10=35 dm c=50/10=5 dm V=a b c=20 35 5=3500 dm3 v=50 dm3/s t=V/v=3500/50=70 min

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