How many red cars are there?

A boy walked 3 km. in the south, then he turned to the west and walked 5 km, then he turned to the North and walked 6 km. Then he turned to the East and walked 5 km. How far is the boy from the starting place? 

In a certain code language, “ARE” is coded as “87”, and “NOT” is coded as “4197”. How will “CAT” be coded in that language? 

123 : 36 : : 221 : ?

Study the following question and decide which of the statements is/are sufficient to answer the question.
Question:
What is the total age of Nakul and Dwij?
Statements:
1. Nakul is 12 years old today.
2. Dwij is younger to Nakul by 3 years.

Direction: In the following question, select the related letters from the given alternatives. 

LEFT : NGHV :: RIGHT : ?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.

RECIPROCATE

One morning Udai and Vishal were talking to each other face to face at a crossing. If Vishal's shadow was exactly to the left of Udai, which direction was Udai facing?