Question

Water is flowing at the rate of 15 km/hour through a pipe of diameter 14 cm into a
cuboidal pond which is 50 m long and 44 m wide. In what time will the level of water in
the pond rise by 21 cm?​

Answer 1

Step-by-step explanation:

radius=7cm=7/100

h=21cm=21/100m

volume of pipe = volume of pond

πr^2h=l×b×h

22/7×7/100×7/100×h=50×44×21/100

22/100×7/100×h=50×44×21/100

h=50×44×21×100×100

22×7×100

h=30000m

h=30km

height of pipe = distance travelled by water

time=distance/speed

time=30/15

time=2 hours

Answer 2

Answer:

120 min or 2 hours

Step-by-step explanation:

radius=7cm=7/100

h=21cm=21/100m

volume of pipe = volume of pond

πr^2h=l×b×h

22/7×7/100×7/100×h=50×44×21/100

22/100×7/100×h=50×44×21/100

h=50×44×21×100×100

22×7×100

h=30000m

h=30km

height of pipe = distance travelled by water

time=distance/speed

time=30/15

time=2 hours

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