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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?

  • Option 1)

    700

  • Option 2)

    550

  • Option 3)

    750

  • Option 4)

    500

  • Option 5)

    600

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