# maths

posted by .

A rectangular reservoir is 120m long,and 75cm wide .at what speed per hour must water flow into it through a square pipe of 20cm wide so that the water rises by2.4m in 18hrs.

• maths -

to rise by 2.4m in 18 hours, the volume must increase by

120*.75*2.4 = 216 m^3/hr

the square pipe has cross-section area of .2^2 = .04 m^2

216 m^3/hr / .04m^2 = 5400 m/hr

## Similar Questions

1. ### math

The spring runoff from melting snow from a certain region is being accumulated in a reservoir. The reservoir is 450 yards long; and its ross-section is an isosceles triangle 40 yards wide at the top and 20square root(3) yards high. …
2. ### Physics

Water flows under pressure from one pipe into a second pipe having half the diameter. The volume flow rate in the narrow pipe is ________ that in the wide pipe, and the speed of the water in the narrow pipe is _______ that in the wide …
3. ### math

Water is flowing at the rate of 15km/hr. Through a cylindrical pipe of radius 7cm into a rectangular tank which is 50m long and 44m wide.In how many hours will the water label in the tank raised by 21cm
4. ### maths

Water is flowing at the rate of 15km/hr through a cylindrical pipe of radius 7cm into a rectangular tank which is 50m long and 44m wide. In how many hours will the water level in the tank raise by 21cm
5. ### math

a rectangular tank,50cm long and 30cm wide,contains water upto a height of 9 cm.a box of dimensions 25cm,25cm,20cm is not placed in the tank so that its square faces rest on the bottom of the tank. the quantity of the water that must …
6. ### maths

K, Q1.A sqhere of radius 5cm is lowered into a rectangular tank 50cm long and 20cm wide containing water to a deqth of 10cm.The sqhere floats with half of its surface above the level of the surface of the water.Calculate (a)the volume …
7. ### maths

K, Q1.A sphere of radius 5cm is lowered into a rectangular tank 50cm long and 20cm wide containing water to a depth of 10cm.The sphere floats with half of its surface above the level of the surface of the water Calculate (a)the volume …
8. ### cfgcfhbcncf

Water is flowing at the rate of 5km/hr through a cylindrical pipe of radius 7cm into a rectangular tank which is 50m long and 44m wide. In how many hours will the water level in7 cm of tank to filled
9. ### Maths

Water is flowing at a rate of 15 km/hr through a cylindrical pipe of radius 7cm into a rectangular tank which is 50m long and44m wide. In how many hours will the water level in the tank raise by 21 cm?
10. ### Physics

Water flows into one end of a horizontal, cylindrical pipe at 2.0 m/s. The pipe then narrows until its diameter at the opposite end is only 1/3 of that at the beginning. (a) What is the flow speed at the narrow end of the pipe?

More Similar Questions