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Directions for the below 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?

1. 700
2. 550
3. 600
4. 500
5. cannot be determined
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From A to B

Speed of plane + Speed of air = Resultent speed

distance covering by plane 3000km in 4 hours

Resultent speed =3000/4=750 km/hr

So, Speed of plane = 750 - 50 =700km/hr

From B to A

Speed of plane - Speed of air = Resultent speed

Resultent Speed 3000/7=428.57km/hr

Speed of plane=428+50=478km/hr

So, Ans is (E) Cannot be determined
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A and B are in different time zones..

+1 vote