A boy standing in the middle of a feild observes a flying bird in the north at an angle of elevation of 30 and after 2 mins ,he observes the same bird in the south at an angle of elevation of 60
if the bird flies all along in a st line at a height of 50rt3 then its speed in km is??

• let bird covers x mtr distance in 2 min
  & distance from north point to the boy is y mtr
  tan30= 50rt3/y
  y=150
  tan60= 50rt3/(x-150)
  x=200 mtr
  speed= 200/2*60 mtr/sec
  = 200*18/120*5 km/hr
  = 6 km/hr
  
• 12 years agoHelpfull: Yes(2) No(0)