Quantitative Aptitude - Arithmetic Ability Questions

A boy crosses a 300 metres wide road in 30 seconds. What is his speed (in km/hr)?

P does half as much work as Q in 1/3 of the time. If together they take 15 days to complete a work, how many days will P take to do it alone?

If the diameter of a sphere is 14 cm, then what is the surface area (in sq.cm) of the sphere?

The difference between compound interest and simple interest on a certain sum of money for 2 years at 5% per annum is Rs. 41. What is the sum of money?

If (1 -­ cosA)/(1 + cosA) = x, then the value of x is

If x + y + z = 0, then what is the value of (3y2 + x2 + z2 )/(2y2 – xz)?

Identify the odd one out from the following:

The mean of a distribution is 20 and the standard deviation is 4. What is the value of the coefficient variation?