Mathematics
Senior Mathematical Challenge
2023
4

4

In 2016, the world record for completing a 5000m three-legged race was 19 minutes and6 seconds. It was set by Damian Thacker and Luke Symonds in Sheffield.

What was their approximate average speed in km/h?

A. 10

B. 12

C. 15

D. 18

E. 25

Answer

C. 15

‍

SOLUTIOn

The average speed running 5000 m in 19 minutes and 6 seconds is approximately the same as running this distance in 20 minutes. So their average speed was approximately 5000/20 metres per minute, that is 250 metres per minute.

A speed of 250 metres per minute is the same as 60 × 250 metres per hour, that is, 15 000 metres per hour. This is the same as 15 km/h

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