Question 296611
1) offering a car for $100pw including 100km for free & then 11c per km 
2) offering a car for $75pw including 150km for free & then 15c per km 
c=100+.11*(k-100)
c=75+.15*(k-150)
set them equal and solve for k
k=912.5 km
It will cost 189.375 for each