Two vehicles leave the same point in opposite directions at 45 and 55 miles per hour. How far apart are they after 3 hours?

Correct answer to question 85 (Arithmetic Reasoning): 300 miles

Method

Moving apart, the gap grows at the sum of the speeds, 100 miles per hour, so after 3 hours they are 300 miles apart. The choice 30 uses the difference, which would apply if they were travelling the same way.