Quantitative Aptitude - Arithmetic Ability Questions

Determine the value of a/b + b/a when a + b = 8 and ab = 4.

What is the time taken by a 180 m long train running at 54 kmph to cross a man standing on a platform?

Find the sum of interior angles of a decagon?

A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50m from the tower. After 8 sec., the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

Two circles touch each other internally. The radius of the larger circle is 6 cm and the distance between the centre is 2 cm, then the radius (in cms) of the other circle is

If X and Y are the two digits of the number 347XY such that the number is completely divisible by 80, then what is the value of X + Y?

The area of a circle is 38.5 cm2. Find its circumference (in cm).

A spherical glass vessel has a cylindrical neck 7 cm long and 4 cm in diameter. The diameter of the spherical part is 21 cm. Find the quantity of water it can hold.