Recent content by NettioB

t1 = v1 / L t2 = v2 / L Vavg = 2L2 / (v1 + v2) = 2L2 / (135 + 90) = L2 / 112.5 Where can I go from here?

If L = lap distance and T1 and T2 = time to travel each lap, we can write: Average speed = 4L / (T1 + T2) But I can't get further than this.

With this information I cannot. We only have two average speeds, one per lap (or two constant speeds, one per lap). We have neither a distance or a time.

The question is located at: http://twitter.com/BritishMensa/status/20563510467

Homework Statement Hi I read a question recently on the British Mensa website and I thought the answer was 112.5mph. The answer given was 108mph. What is the calculation for this scenario? "Lap 1 is completed at 135mph, lap 2 is completed at 90mph, what’s the average speed?"...