Math Ms. Sue please help
posted by Anonymous .
Flying to Kampala with a tailwind a plane average 158km/h. On the return trip the plane only averaged 112km/h while flying back into the same wind. Find the speed of the wind and the speed of the plane in still air.
Please can someone else help me?
speed of plane in still air --- x mph
speed of wind ------------ y mph
so going with the wind, speed = x+y
against the wind, speed = x-y
x+y = 158
x-y = 112
2x = 270
x = 135
then 135 + y = 158
y = 23
speed of wind is 23 mph, speed of plane in still air = 135 mph