Homework Help: Math Ms. Sue please help

Posted by Anonymous on Thursday, February 28, 2013 at 9:11pm.

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.

I don't know! - Ms. Sue, Thursday, February 28, 2013 at 9:12pm
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Math please help - Anonymous, Thursday, February 28, 2013 at 9:44pm
Please can someone else help me?
Math Ms. Sue please help - Reiny, Thursday, February 28, 2013 at 10:32pm
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
add them
2x = 270
x = 135
then 135 + y = 158
y = 23

speed of wind is 23 mph, speed of plane in still air = 135 mph

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