The area of the rhombus whose diagonals are 20 cm, 12 cm is

The volume of a sphere-shaped shot-put is 310.464 cu.cm, then the radius is 

Ram walks 12 kilometer to the north then 10 km east and then 12 km south. How far is he from the starting point

A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work is

A wheel makes 48 revolutions in 3 seconds. How many revolutions does it make in 30 seconds

The mode of the observations 

2,3,7,8,4,2,4,3,9,2,7,4, is