Quantitative Aptitude - Arithmetic Ability Questions

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

What is the distance between the points (3 , 6) and (-2 , -6)?

A and B undertake a piece of work for Rs. 250 . A alone can do that work in 5 days and B alone can do that work in 15 days . With the help of C, they finish the work in 3 days . If every one gets paid in proportion to work done by them, the amount C will get is 

The least number that must be substracted from 63520 to make the result a perfect square is

Which of the following numbers is not composite?

If (a+1a)2=3,then the value of a6-1a6 will be

What is the simplified value of (cosec A + sin A)(cosec A – sin A)?

A 600 metres long train is running at the speed of 81 km/hr. If it crosses a platform in 40 seconds, then what is the length of the platform (in metres)?