Question

A road map represents an actual distance of 18 km by 1 cm in it. If a boy drives a road for 216 km, what would be the corresponding distance covered in the map ?

• A. 12
• B. 11
• C. 21
• D. 22

Answer 1

The correct option is A 12

The distance on the road is directly proportional to the distance on the map

Let $acm$ be the distance on the map for distance $216km$
So, $18:216=1:a$

Applying the rule, product of extremes $=$ product of means

$18\times a=216\times 1$

$a=\frac{216}{18}$

$a=12$

Hence, the distance on the map for $218km$ is $12cm$