Question

Water in a canal, 30 dm wide and 12 dm deep, is flowing with velocity of 100 km per hour. How much area will it irrigate in 30 minutes, if 8 cm of standing water is required?

Answer 1

30*12=360==> area

Answer 2

careful about the units,
may be convert everything into cm

Answer 3

50km will be irrigated in 30 minutes

Answer 4

1dm=10cm

Answer 5

\[\large 300 \times 120 cm^2 \times \dfrac{100\times 1000\times 100 cm}{60 ~min} = 6\times 10^9 cm^3/min\]

Answer 6

it is 30 minutes

Answer 7

300*120/8=4500

Answer 8

In 30 minutes :

\[\large 6\times 10^9 cm^3/min \times 30 min = 180\times 10^9 cm^3 \]

water flows from the canal into the irrigation land

Answer 9

how 100*1000*100cm?.100km=10000m

Answer 10

10000m=1000000cm=10 00 00 00

Answer 11

100km

100 * 1000m

100 * 1000*100cm

Answer 12

i have changed everything into `cm`

Answer 13

yes

Answer 14

u r right:)

Answer 15

we're not done with the problem yet
we got volume of water that went through the canal in 30 minutes, but we don't know how much land it will irrigate right ?

Answer 16

how much land can you irrigate with \(\large 180 \times 10^9 cm^3\) of water ?

Answer 17

an ideas ?

Answer 18

180*10^9cm^3/8

Answer 19

again, pay attention to the units

Answer 20

180*10^9cm^3/8cm

okay ?

Answer 21

22.5*10^9*cm^3

Answer 22

units >.<

Answer 23

when u divide cm^3 by cm, what do u get ?

Answer 24

cm^2

Answer 25

so its

22.5*10^9*cm^2

lets convert it to km^2

Answer 26

22.5*10^9cm^2

Answer 27

or maybe m^2

Answer 28

225000

Answer 29

225000m^2

Answer 30

100cm = 1m
(100cm)^2 = 1m^2
10^4cm^2 = 1m^2

Answer 31

22.5*10^9*cm^2 = 22.5*10^5*m^2

Answer 32

= 2.25*10^6*m^2

Answer 33

= 2.25 km^2

Answer 34

yesssssssss........