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Question

# The hummingbird has an average wing speed of $70$ beats per second. The expression $70 t$ gives the number of wingbeats in $t$ seconds.Calculate the number of wingbeats in 1 hour for the hummingbird.

Solution

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The problem asks to calculate the hummingbird's total number of wingbeats in $1$ hour. Since the given average wing speed is in beats per second, hence, we must convert time $t$ from hour to seconds. That is,

\begin{aligned}t= 1 \,\, \cancel{\text{hr}} \times \dfrac{60 \,\, \cancel{\text{min}}}{1 \,\, \cancel{\text{hr}}} \times \dfrac{60 \,\, \text{sec}}{1 \,\, \cancel{\text{min}}} =3600 \,\, \text{sec}. \end{aligned}

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