Averaging Out Their Differences

Algebra Level 5

Ben, the ultimate hero, spends 10 minutes to solve a math problem.
The pretty and smarter Gwen only needs 6 minutes to come up with an answer.
Kevin, on the other hand, doesn't attend any school, so he takes 15 minutes for the same task.

What is the average time per person required for this team to solve a math problem?


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