A car travels 180 km from A to B at 60 kilometers per hour and returns from B to A along the same route at 90 kilometers per hour. The average speed, in kilometers per hour, for the round trip is :

A man has 72 green marbles and 108 red marbles. He decides to pack them into packets of the same size, each co...

Half of the student of a school play football and one third of the rest play cricket. The remaining 300 studen...

Three-fourth petrol of a reservoir is used to fill the petrol tanks of five trucks having the same storage cap...

A boat sails m miles upstream at the rate of r miles per hour. If the rate of the stream is s miles per hour,...

Three times a number minus 7 is 32. What is the twice of the number?

In an examination of four subjects, a student got 70,80, 90 and x marks and his average was 75. What was the v...