KA-0162●○○3 points, difficulty 1 of 33 ptLevel 9–10not yet calibratedTwo towns are 300 km apart. A car leaves each town at the same moment driving toward the other, one at 60 km/h and the other at 90 km/h. How long until they meet?MOD-03Rate, time, distancealso CFT-02, CFT-11
KA-0165●●○4 points, difficulty 2 of 34 ptLevel 9–10not yet calibratedFour litres of a solution that is 25 percent acid are mixed with six litres of a solution that is 50 percent acid. What percentage of the mixture is acid?MOD-08Mixtures and weighted averagesalso NUM-10, CFT-10