Problema Solution
a sparrow has a speed of xkm\hr in still air.if the wind blows at 1 km\hr,she takes 5hrs to fly 12 kms to her nest and 12 kms back again.she goes directly into thwe wind adnd returns with thewind behind her.find her speed in still air.
Answer provided by our tutors
Let speed in still air = x km/h
12/(x+1) + 12/(x-1) = 5
24x = 5x^2 - 5
(x - 5)(5x +1) = 0
x = 5 km/h