An aeroplane flies around a square field ABCD of each side 1000 km. Its speed along AB is 250 text kmh-1, along BC 500 text kmh-1, along CD 200kmh-1, and along DA 100 text kmh-1 . Its average speed (in kmh-1 )over the entire trip is

Question

An aeroplane flies around a square field ABCD of each side 1000 km. Its speed along AB is 250 text kmh-1, along BC 500 text kmh-1, along CD 200kmh-1, and along DA 100 text kmh-1 . Its average speed (in kmh-1 )over the entire trip is (A) 225.5 (B) 175.5 (C) 125.5 (D) 310.5

Tardigrade Admin · Accepted Answer

Time along the AB=(1000/250)=4 text h Time along the BC=(1000/500)=2 text h Time along the CD=(1000/200)=5 text h Time along the AD=(1000/100)=10 text h Average speed =(Total dis tan ce/Total time) =(4× 1000/4+2+5+10)=(4000/21) =190.5 text km/h

Q. An aeroplane flies around a square field ABCD of each side 1000km. Its speed along AB is 250kmh−1, along BC 500kmh−1, along CD 200kmh−1, and along DA 100kmh−1 . Its average speed (in kmh−1 )over the entire trip is

225.5

175.5

125.5

310.5

190.5

Time along the AB=2501000​=4h Time along the BC=5001000​=2h Time along the CD=2001000​=5h Time along the AD=1001000​=10h Average speed =TotaltimeTotaldistance​ =4+2+5+104×1000​=214000​ =190.5km/h

Q. An aeroplane flies around a square field $A BC D$ of each side $1000 km$ . Its speed along $A B$ is $250 km h^{- 1},$ along $BC$ $500 km h^{- 1},$ along $C D$ $200 km h^{- 1},$ and along $D A$ $100 km h^{- 1}$ . Its average speed (in $km h^{- 1}$ )over the entire trip is