Answer:
6 km
Step-by-step explanation:
Given,
The part of the race have finished = \(\frac{3}{4}\)
And, the distance of race have completed = \(4\frac{1}{2}\)
That is,
\(\frac{3}{4}\text{ part of the race}=4\frac{1}{2}\text{ km}=\frac{9}{2}\text{ km}\)
\(\implies 1\text{ Part of the race}=\frac{4}{3}\times \frac{9}{2}=\frac{36}{6}=6\text{ km}\)
Hence, the length of the marathon would be 6 km.
