R

Rohan Raj • 6.53K Points
Tutor III Math 

Q. A plane flies along the four sides of a square field at a speed of 200, 400, 600 and 800 km/hr. Then find the average speed of plane around the square field.

  • (A) 394
  • (B) 400
  • (C) 414
  • (D) 384
Correct Answer - Option(D)
Explanation by: Rohan Raj 
Let the side of the square field be x and the average speed of plane be y

x/200 + x/400 + x/600 + x/800 = 4x/y
⇒ 25x/2400 = 4x/y
⇒ y =384

∴ Average speed is 384 km/hr

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