An airplane

An airplane flies 1440 km in 2 1/4 hours. What is its average speed in km per hour?

Correct answer:

v =  640 km/h

Step-by-step explanation:

$$\begin{gathered} s=1440\text{ km } \\ t=2{\displaystyle \frac{1}{4}}=2+{\displaystyle \frac{1}{4}}={\displaystyle \frac{2\cdot 4+1}{4}}={\displaystyle \frac{9}{4}}=2.25\text{ h } \\ v=s\mathrm{/}t=1440\mathrm{/}2.25=640\text{ km/h} \end{gathered}$$

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