If a boat rental company charges 100.00 a day plus .50 per kilometer and another company charges 90.00 a day plus .60 per kilometer, at how many miles would the bill at both companies be the same?

Answer 1

cost is the same when
100.00 + .50x = 90.00 + .60x
now just solve for x

then, unless there's a typo, convert km to miles!