If the perimeter of a circular plot is equal to the perimeter of a square plot, what will be the ratio of their areas?

A boat takes 16 minutes and 24 minutes to cover a certain distance downstream and upstream, respectively. If the speed of the boat in still water is 15 km/h, find the speed of the stream.

The sum for 2 years gives a compound interest of ₹ 3225 at 15 % rate. Then sum is 

Find out the equation of line which is perpendicular to 2x - 3y = 5 and passes through point (1,1).

From a point 20 m away from the foot of a tower, the angle of elevation of the top of the tower is 30°. The height of the tower is

The average of 6 numbers is 20. If a number is removed then average becomes 15. In place of removed number by adding a number 39 the average of new 6 number will be__

The number which can be written in the form of n (n+1) (n+2), where n is a natural number, is: 

The ratio of investment of two partners is 11: 12 and the ratio of their profits is 2: 3. If A invested the money for 8 months, find for how much time B invested his money?