Imaginen que un maratonista corre toda una carrera a una velocidad constante. después de dos horas lleva recorridos 22 km •¿cuánto tarda en correr los 42 km de la competencia?

For this case we have:

If after 2 hours the marathon runner has traveled 22 kilometers we have:

2h -----------> 22km

Applying a rule of three, we can know the time it takes to run 42km. So, we have:

2h -----------> 22km

x -------------> 42km

Where "x" is the time it takes to travel 42km. Resolving we have:

Thus, after 3.82 hours the marathon runner will travel 42km.

3.82 hours

the answer is c. 23/3

12cm

the answer is d