Here's how to convert miles per hour to kilometers per hour:

1. Conversion Factor:

* 1 mile is approximately equal to 1.60934 kilometers.

2. Calculation:

* Multiply the speed in miles per hour by the conversion factor:

520 miles/hour * 1.60934 kilometers/mile ≈ 837.08 kilometers/hour

Answer: The 747 jetliner is cruising at approximately 837.08 kilometers per hour.