Triathlon and Fitness printable worksheet
The triathlon is a sport which consists of three consecutive races, a swim, a bike race and finally a long run.
Adam, Ben and Charles all want to qualify for the Olympic triathlon.
Here are their results from a trial race:

Swimming 1500m 
Cycling 40km 
Running 10km 
TOTAL 
Adam 
19:12 
1:04:33 
32:13 
1:55:58 
Ben 
21:19 
1:05:28 
31:54 
1:58:41 
Charles 
22:31 
1:03:22 
30:12 
1:56:05 
Which athlete do you think burned the most calories?
Adam, Ben and Charles weigh approximately 70kg each
It is estimated that athletes of this weight burn energy at the following rates:
Assuming that the rate at which calories are burned is directly proportional to the athletes' speed, estimate how many calories each of the three athletes burned during his race.
Are you surprised?
How can you explain your results?
Do you think the modelling assumptions are valid?