One athlete has a running speed of 6 miles per hour, and a biking speed of 10 miles per hour, and completes the event in an hour and a half.?

Question

Update:

How long, in miles, is each segment of the race?

Answer 1

One athlete has a running speed of 6 miles per hour, 

and a biking speed of 10 miles per hour, 

and completes the event in an hour and a half.

How long, in miles, is each segment of the race?

It could be 3 miles of running and 10 miles of biking.

Answer 2

It could be 9 miles of running. 9 miles / 6 mph = 1.5 hours.

It could be 15 miles of biking. 15 miles / 10 mph = 1.5 hours.

Or any combination, in the right proportions.