Quantitative Aptitude - Arithmetic Ability Questions

A person crosses a 900 metres wide road in 120 seconds. What is his speed (in km/hr)?

The third proportional of two numbers 7 and 21 is

Select the odd word/letters/number/number pair from the given alternatives.

From the four corners of a rectangular sheet of dimensions 25 cm x 20 cm, square of side 2 cm is cut off from four corners and a box is made. The volume of the box is

Find k, if the line 2x- ­3y = 11 is perpendicular to the line 3x + ky = -­4?

If a + b = 11 and a2+ b2= 61, then value of ab is

A trader had 1200 kgs of rice. He sold a part of it at 5% profit and the rest at 11% profit, so that he made a total profit of 7%. How much (in kg) wheat did he sell at 5% profit?

Of the 3 numbers whose average is 22, the first is 3/8th the sum of other 2. What is the first number?