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Water tank problem

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You live in the ground floor of a high rise apartment block. The over head water tanks which supply water to all the apartments are situated on the rooftop. When water flow through the taps in your apartment is low, you go to inspect the water level in the tank on the rooftop. You check the water level in the tank and do the needful [get the tank filled]. How can you sort out the problem of checking the water level in the tank without going to the rooftop every time the water flow is low or water stops flowing?

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https://brainmass.com/physics/light-vision-optics/high-rise-apartment-block-water-flowing-3210

Solution Preview

First get the water tank fully filled with water. Place a float [a foot ball bladder filled with air] on the water in the tank. Tie the float with a long light nylon rope such that one end is attached to the float and other end hangs freely [without anything blocking it en ...

Solution Summary

Water tank problem is solved. The water flowing in a chart is examined. The expert determine how you can sort out the problem of checking the water level in the tank without going on the roof every time.

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Word Problem

Please help in resolving this problem:

A water tank has an inlet pipe and a drain pipe. A full tank can be emptied in 30 minutes if the drain is opened and an empty tank can be filled in 45 minutes with the inlet pipe opened. If both pipes are accidentally opened when the tank is full, then how long will it take to empty the tank?

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