Verbal Reasoning - Mental Ability Questions

From the given alternatives, select the word which CANNOT be formed using the letters of the given word.

Countermand

Select the related word/letters/number from the given alternatives.
30 : 16 :: 24 : ?

A man travels 10 km towards west, then he takes a turn towards north-­east and travels 20 km in the direction. He again takes a turn towards south-­east and covers 5 km. Taking starting point as the origin, in which direction is he now?

Two Person P an d Q ar e separ ated by a distan ce of 20 meterin west-east direction respectively. Now P and Q startwalking in north and south direction respectively and walkedfor 5 meter. Now P and Q took a right turn and walked 10meach . Now P an d Q took left tur n an d aft er walkin g 5 meterboth of them stopped. Find the distance between them

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.
 
15 x 4 ÷ 35 - 70 + 16 = ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

50 + 3 ÷ 125 x 5 - 25 = ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

50 + 5 - 700 x 28 = ?

A migrating bird flies 40 km North, then turns East and flies 50 km, then turns North and flies 110 km, and turns to its left and flies 50 km. Where is it now with reference to its starting position?