Find the exact value of the following question:

$$ \sqrt {123×8+2389-1164}=? $$

Find the distance travelled by a 40 cm diameter wheel to cover a distance of 176 meters? Using (π=22/7)

a and b are two whole numbers and c is their HCF, then the LCM of those two numbers is

If the height of a perpendicular cylinder is 10 cm and its curved surface area is 440 square cm, what is its radius?

The sum of two numbers is 45 and their ratio is 7: 8. The two numbers are:

If the areas of circular ring having inner and outer radius 8 cm and 12 cm respectively is equal to the total surface area of cylinder of radius R₁ and height h, then h in terms of R₁ will be :

What is the sum of two consecutive even numbers, the difference of whose square is 84? 

Directions: Each of the questions consists of a question followed by three statements. You have to study the questions and the statements and decide which of the statements(s) is/are necessary to answer the question. 

What is the speed of the train?
 I. The train crosses a signal pole in 13 sec.
 II. The train crosses a platform of length 250 m in 27 seconds.
 III. The train crosses another train running in the same direction in 32 seconds.