How is Q related to

Select the related word/letters/number from the given alternatives.

Boat : Stream  : :  ?   :  Track

Select the option that is related to the third number in the same way the second number is related to the first number.

23: 7 :: 29: ?

HJIK : MONP : : PRQS : ?

Given set:  [15, 117, 51]

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.

Choose the figure that best represents the relationship among the classes given below.

Company, School, Culture, Health

If 38 @ 9 = 66 and 63 @ 43 = 122, then 29 @ 57 = '?'.