A train travels at a certain average speed for a distance of 63km and then travels a distance of 72km at an average speed of 6km/hr more than its original speed. If it takes 3 hours to complete the total journey, what is its original average speed?

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?