A student walks from his house at a speed of  K per hour and reaches his school 6 minutes late. The next day he increases his speed by 1 km per hour and reaches 6 minutes before school time. How far is the school from his house?

A man buys an article for 10% less than its value and sells it for 10% more than its value. His gain or loss p...

A reservoir has two pipes, A and B. A can fill the reservoir 5 hours faster than B. If both together fill the...

What is the average of odd numbers from 1 to 40?

How many different numbers of two digits can be formed with the digits 1, 2, 3, 4, 5, 6; no digit being repeat...

If the area of a triangle with base x is equal to the area of a square with side x, then the altitude of the t...

If the radius of a circle is reduced by 40%, its circumference is reduced by-