To convert Delta's speed from miles per hour to kilometers per hour, we can use the conversion factor where 1 kilometer is approximately equal to 0.62 miles.
First, we need to find out how many kilometers are in 17 miles. We can use the conversion factor:
\[ \text{km} = \text{miles} \times \frac{1 \text{ km}}{0.62 \text{ miles}} \]
Now, substituting the value:
\[ \text{km} = 17 \text{ miles} \times \frac{1 \text{ km}}{0.62 \text{ miles}} \approx 27.41935484 \text{ km} \]
Rounding to the nearest tenth, we get:
\[ \text{km} \approx 27.4 \]
Thus, her speed in kilometers per hour is approximately 27.4 km/h.
The correct answer is:
a. 27.4