Posted by Calie on .
gregor is planning a driving trip where he knows that half his trip will be along major highways and part on country roads. The speed limit is 100km/h on highways and 60km/h on other roads. the total time he wants to spend driving is 12h. I set up the equation: 10h+6r=12, but I don't know how to solve for 3 more combinations of times gregor could spend driving on highways and country roads. please help

math 
Damon,
He is going some distance, call it 2d
then
he goes 1d at 100 km/hr
and
he goes 1 d at 60 km/hr
time = distance / speed
so
d/100 + d/60 = 12
multiply both sides by 300
3 d + 5 d = 3600
8 d = 3600
d = 450
so
2 d = 900 km, the distance he goes