Triathlon: Swim, Cycle, Run

March 23, 2015

Wren is competing in a triathlon that includes swimming, cycling and running. For the first two segments of the race, Wren swam an average of 4 km/h, then cycled an average of 40 km/h. It took 81.75 minutes for Wren to complete the first two segments of the race, swimming and cycling a combined total of 43.29 kilometers. How many minutes did it take him to complete the cycling portion of the race? Express your answer as a decimal to the nearest hundredth.

 

When Wren has completed the triathlon, he will have swam, cycled and run a combined total of 52.95 kilometers. If he wishes to complete the entire race in 140 minutes or less, at what minimum average speed, in kilometers per hour, must he run the third, and final, portion of the race? Express your answer as a decimal to the nearest hundredth.

 

After completing the race, the distance that Wren swam will account for what percent of the combined total distance of the triathlon? Express your answer to the nearest hundredth.