Quantitative Aptitude - Arithmetic Ability Questions

A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of 450√3 metres from point P observes that angle of elevation of the balloon is 60 deg. Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon?

What is the quotient when 1359 is divided by 48?

If the product of two numbers is 2522 and their LCM is 97 then their HCF is

3cosA is equal to

Find the value of x if 0.08x + 0.04y = 10 and 0.2(x-1) + 0.4y = 24.8

The least number, which when divided by 5, 6, 7 and 8 leaves a remainder 3 in each case, but when divided by 9 leaves no remainder, is:

In the following question, select the missing number from the given series.
 
1912, 2012, 2133, 2277, 2446, ?

What will be the value of xy, if x2+y2 = 45 and x-y=5 ?