**Question:**Cities A and B are in different time zones. A is located 3000 km east of B. The table below describes the schedule of an airline operating non-stop flights between A and B. All the times indicated are local and on the same day.

Departure | Arrival | ||

City | Time | City | Time |

B | 8:00 am | A | 3:00 pm |

A | 4:00 pm | B | 8:00 pm |

Assume that planes cruise at the same speed in both directions. However, the effective speed is influenced by a steady wind blowing from east to west at 50 km per hour.

What is the plane’s cruising speed in km per hour?

- 700
- 550
- 600
- 500
- Cannot be determined.

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