What is the square root of 0.09 ?

If  $$ \ {xy\over x+y}= a, $$ $${xz\over x+z}=b $$ and $$ {yz\over y+z} =c $$  where a, b, c are all non – zero numbers, then x equals to

A man sets out on a journey. He traveled for a total of 16 hours. He covered the first half of the distance at a speed of 40 km per hour and the second half at a speed of 60 km per hour. How much distance did he cover?

If 3 sin x + 5cosx = 5 then what is the value of (3cosx - 5sinx)

A man walks a certain distance and rides back in 4 hours 30 minutes. he could ride both ways in 3 hours. The time required by the man to walk both ways is 

If $${144\over0.144}={14.4\over x}$$, then the value of x is

If a=x+y, b=x-y, c=x+2y, then $$ {a^2+b^2+c^2}-ab-bc-ca $$ is

The diameter of a wheel is 14 cm. How many rotations will it take to cover a distance of 44 kilometres?