Correct Answer: The distance between A and B is 3 kms.

Explanation:

Let, the distance between A and B is x kms

Mr. Arif can travel 10 minute the distancex km.

Mr. Arif can travel 1 hour the distance = $\frac{x\cdot 60}{10}$
$\frac{x \cdot 60}{10}$
= 6x

Afzal can travel in 1 hour = $\frac{x\cdot 60}{9}$
$\frac{x \cdot 60}{9}$
=$\frac{x\cdot 20}{3}$
$\frac{x \cdot 20}{3}$

According to the question

$\frac{x\cdot 20}{3}$
$\frac{x \cdot 20}{3}$
-6x =2

=> 20x — 18x = 6

=> 2x = 6

=> x = 3