Q. A plane travels in the shape of equilateral triangle have sped of 20km/hr, 40km/hr and 60km/hr. Find the average speed of the palne.

• ave speed = total distance/total time taken
  =(d+d+d)/[(d/20)+(d/40)+(d/60)] where d= side of eq. triangle
  =3d/d[1/20 + 1/40 + 1/60]
  =3*20*40*60/[20*40+40*60+20*60]
  = 360/11 km/h
  = 32.73 km/h
• 11 years agoHelpfull: Yes(54) No(0)
• the average spped when 3 terms are given= 3s1s2s3/(s1s2+s2s3+s1s3)
  =3*20*40*60(20*40+40*60+20*60)=360/11 is tha average speed
• 11 years agoHelpfull: Yes(40) No(0)
• total distance/total time
  =360/11
• 11 years agoHelpfull: Yes(5) No(4)
• 360/11 km/hr
• 11 years agoHelpfull: Yes(3) No(1)
• avg speed = total distance/total time
  Ans. 360/11
• 11 years agoHelpfull: Yes(2) No(1)
• 60+40+20/3
  120/3
  40 km/hr
• 11 years agoHelpfull: Yes(1) No(25)
• 3xyz/(xy+xz+yz)
  =3*20*40*60/60+80+100
  =144000/2400
  =60
• 11 years agoHelpfull: Yes(1) No(9)
• ans=32.72
  3*d/(d/20+d/40+d/60)
• 9 years agoHelpfull: Yes(0) No(1)