Please solve this problems in physics f wbk sec2 no 14

Please solve this problems in physics f wbk sec2 no 14 An aeroplane flies round a square field PORS Of each side 1000 km. Its speed along PQ is 400 km/h along QR 500 km/h, along RS 600 km/h and along SP 700 krn/tE The average speed ot the aeroplane over the entire tnp (A) 550 km}h (C) 527 km/h (B) 600 km/h (D) 500 The ti ure shows the displacement of the body moving along a