To convert Delta's speed from miles per hour to kilometers per hour, we can use the conversion factor that 1 kilometer is approximately equal to 0.62 miles. First, we need to determine how many kilometers are in 1 mile, which can be done by taking the reciprocal of 0.62:
\[ 1 \text{ mile} = \frac{1}{0.62} \text{ kilometers} \approx 1.613 \text{ kilometers} \]
Now, we can convert Delta's speed of 17 miles per hour to kilometers per hour:
\[ \text{Speed in km/h} = 17 \text{ miles/h} \times 1.613 \text{ km/mile} \]
Calculating this gives:
\[ \text{Speed in km/h} \approx 17 \times 1.613 \approx 27.4 \text{ km/h} \]
Rounding to the nearest tenth, the speed is still 27.4 km/h.
Therefore, the answer is:
27.4