Travelling at 60 mph for 3 hours, how far do you travel?

Average speed = total distance ÷ total time. Never average the speeds themselves. The correct answer is 180 miles. Traps to avoid: 90 miles comes from the "sdt rearrange error" error; 240 miles comes from the "sdt rearrange error" error; 3 miles comes from the "sdt rearrange error" error; 63 miles comes from the "sdt rearrange error" error.