Keeping track of thousands of runners in a major road race is a difficult task, but when it comes to several different races at the same time spread over more than 26 miles, the problems are more complex.

In Monday's Deseret News-KSL Radio race events, timers will be keeping track of more than 400 runners, both male and female, in the 19th annual marathon starting at 5:15 a.m. at Washington Park in Parleys Canyon.One hour later and 20 miles away, race officials will start the fifth annual 10K at 6:15 a.m. at Research Park on the University of Utah campus. The starting times of the two races are staggered one hour apart to avoid a major congestion when the marathoners reach the start of the 10K.

For the 10K, the male and female runners - more than 2,200 - are timed as two different races. Just prior to the 10K, entrants in the wheelchair race will begin the 6.2-mile race to the finish line at Liberty Park.

Furnishing the hardware for the races Monday will be Business Computer Systems, 530 E. 400 South. The company provided the equipment last year for the races, according to Max Bylund, timing official.