Thus, the times when the rate of change of efficiency is zero are $\boxed2$ and $\boxed4$ hours after sunrise.

Thus, the times when the rate of change of efficiency is zero are $\boxed2$ and $\boxed4$ hours after sunrise. - AMAZONAWS

Thus, the Times When the Rate of Change of Efficiency is Zero: 2 Hours and 4 Hours After Sunrise

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$Thus, the times when the rate of change of efficiency is zero are $\boxed{2}$ and $\boxed{4}$ hours after sunrise.$