Zendaya takes 1/3 * 6 hours = <<1/3*6=2>>2 hours longer to complete the marathon.

To complete the marathon, Zendaya takes 6 hours + 2 hours = <<6+2=8>>8 hours

The combined time the two take to complete the marathon is 8 hours + 6 hours = <<8+6=14>>14 hours

The average number of hours Casey and Zendaya take to complete the marathon is 14 hours / 2 people = <<14/2=7>>7 hours/person.

# Answer

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<|im_start|>system
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<|im_start|>user
Casey takes 6 hours to complete a marathon race, while Zendaya takes 1/3 times longer to cover the same distance. What is the average time the two take to complete to race?
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7
Casey takes 6 hours to complete a marathon race, while Zendaya takes 1/3 times longer to cover the same distance. What is the average time the two take to complete to race?
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