You have data on the training regime of 100m elite runners. For each runner you observe their best run of the year (in second) PPO ), the number of hours they train each week (() and a dummy variable equal to 1 if their are male (male). Using OLS you get the following regression: ph = 36.2 - 1.3male - 0.92tr + 0.009/r -0.09male . fr + 0.001male . () How many hours should a male elite runner train each week to minimize the time of their best run of the year? (round to the closest decimal)