On a map, 1 centimetre represents 100,000 centimetres. What is the length of a road in

kilometres that measure 2.9 centimetres on the map?

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2.9

2900

0.29

answer is B.

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Detailed Solution

Concept: Calculate the street length using the unit method. As in the question, given the length represented by 1 cm on the map, we need to find the distance measured at 2.9 cm.
According to the question, 1 cm on the map is equivalent to 100,000 centimetres.
1 cm on map = 100000 cm on road……….(i)
Then you need to find the length of the road in kilometres, expressed in 2.9 cm. According to a unified method;
When "1" unit of

unit of B
Next, the "K" unit of

the unit of B. Here, a 1 cm on map = 100000 cm on road
2.9 cm of map =(

2.9 \times 100000)

cm of road
= 290000 cm of road
The required road length is in centimetres. But according to the question, you need to find this length in kilometres. Now use unit conversion.
We know

And

So, the required length of road = 2.9 km.
Hence, option 2 is the correct answer.

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