Verbal Reasoning - Mental Ability Questions

Rohan, after walking 5 km towards west, turns left and then walks for 12 km more. Find the shortest distance between his initial and final position.

If 4 * 2 = 3 and 8 * 4 = 3 , then 21 * 7 = ?

In the following question, select the related word pair from the given alternatives.
Heart : Organ : : ? : ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
KV, LU, MT, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
LOQ, SVX, ZCE, ?

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.

master, ember, bombay, animal, abdomen, ?

What will come in place of the question mark (?) in the following number series?11, 19, 40, 87, 173, ?