Max runs the first 4km of her training session at 8 km/h.
At least how many kilometers must she run at 15 km/h
in order to average 12 km/h for the whole session?
Max ran 4 km at 8 km/hr.
. . This took hours.
She will run more km at 15 km/hr.
. . This will take hours.
She will run a total of: hours.
She will run a total of km at an average speed of 12 km/hr.
. . Her total time will be: hours.
There is our equation! .