Respuesta :

if she runs 10 km a hour. then she runs for 2 1/2 hours she runs 25 km. for half an hour she runs 5 km. hope this helps you
so she runs 10km/1hr
so ?km/.5hr

do cross multiplication

(10) (0.5) = (1)(x)
5 = x
so in half an hour = 5 km

do the same thing for the 2.5 just put it instead of the 0.5 and solve
Good Luck!

Hope this helps ;)