Question

The length , breadth and height of cuboid water tank is 7cm,6cm and 2cm respectively. If 4200 litre of water tank is pumped out from the tank. Find the fall in water level in the tank ​

Answer 1

The fall in water level in the tank ​was 1000m.

First we need to convert the volume in litre to m³

As, 1 litre = 0.001 m³

So, 4200 litres = 4.2 m³

As,

Volume of tank = Length x Breadth x height

= 0.07 × 0.06 × 0.02                  [Converting cm to m, as 1cm = 0.01m]

= 8.4×10⁻⁵ m³

Let us consider the height to be 'h'.

Length = 0.07m and Breadth = 0.06m, and volume of water pumped out was 4.2m³. So,

4.2 =  0.07 × 0.06 × h

⇒ h = 1000m

This is the height by which water falls.