A water filter takes 40 minutes to filter 20 litres of water. Another filter of the same specifications takes 30 minutes to filter the same amount of water. If both the filters are used at the same time. Then how long will it take them to filter the 70 litres of water?

WHAT ARE THE FORMULAS FOR FINDING THE INITAL SPEED

What is the formula of \[{x^2} + {y^2} + {z^2}?\

What is a dodging number?

What is the value of $ 5 $ million dollars in Indian rupees given that one dollar is equal to $ 75 $ Indian rupees.

How many perfect cubes can you find from 1 to 100? How many from -100 to 100?