Quantitative Aptitude - Arithmetic Ability Questions

A plane flies a distance of 1800 km in 5 hours. What is its average speed in meters/second?

The average of 3 consecutive even numbers is A. If next 5 even numbers are added, then what is the average of these 8 numbers?

In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

If a : b is 32 : 35 and b : c is 21 : 32, then a : c is?

If 7A = 5B = 2C; find A : B : C.

The number whose square is equal to the difference of the squares of 37 and 23 is:-

If x = 1/(√2+1) then the value of x2 + 2x - 1 is

If 3x + 5y + 7z = 49 and 9x + 8y + 21z = 126, then what is the value of y?