anonymous
  • anonymous
solve an airplain flew for 4 hours against a head wind of 40km/h. on the return flight the same wind was now a tail wind and the fight took 3 hours. find the speed of the airplain in sill air
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
First lets assume that the velocity of the airplane is v
anonymous
  • anonymous
And also we assume that the velocity of the wind is w
anonymous
  • anonymous
S= d/t s - 40 = d /4 S + 40 = d / 3

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anonymous
  • anonymous
(v-w)4=(v+w)3
anonymous
  • anonymous
D = 4s -160 D = 3s + 120 therefore, 4s -160 = 3s + 120 s = 120 + 160 s = 280 km / hr
anonymous
  • anonymous
Now in place of w just put the value 40 and solve the equation for v

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