Question

A bird is about 6.26.2 in.​ long, with a​ thin, dark bill and a​ wide, white wing stripe. If the bird can fly 9292 mi with the wind in the same time it can fly 6060 mi against the wind when the wind speed is 44 ​mph, what is the rate of the bird in still​ air?

Answer 1

`209` mph

Step-by-step explanation:

`V` = Speed of bird in still air

`v` = Speed of wind = 44 mph

Consider the motion of the bird with the wind

`D_(1)` = distance traveled with the wind = 9292 mi

`t_(1)` = time taken to travel the distance with wind

Time taken to travel the distance with wind is given as

`t_(1) = (D_(1))/(V + v)`

`t_(1) = (9292)/(V + 44)` eq-1

Consider the motion of the bird with the wind

`D_(2)` = distance traveled against the wind = 6060 mi

`t_(2)` = time taken to travel the distance against wind

Time taken to travel the distance against wind is given as

`t_(2) = (D_(2))/(V + v)`

`t_(2) = (6060)/(V - 44)` eq-2

As per the question,

Time taken with the wind = Time taken against the wind

`t_(1) = t_(2)`

`(9292)/(V + 44) = (6060)/(V - 44)`

`(9292) (V - 44) = (6060) (V + 44)`

`9292V - 408848 = 6060V + 266640`

`3232V = 675488`

`V = 209` mph