SOLUTION: An airplane flew for 8 hours with a 20 mph tail wind. The return flight against the same wind took 9 hours. Find the speed of the plane in still air.

Question 419646: An airplane flew for 8 hours with a 20 mph tail wind. The return flight against the same wind took 9 hours. Find the speed of the plane in still air.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
plane speed =x mph
wind speed 20 mph

time with tail wind 8 hours
time against wind 9 hours
Distance = same
8(x+20 )=9(x-20)
8 x +160 = 9 x -180
9 x -8 x = 160 +180
x = 340 mph plane speed

RELATED QUESTIONS
An airplane flew for 6 hrs. with a tail wind of 60km/hr. The return flight against the... (answered by nerdybill)

An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same (answered by Paul)

An airplane flew for 4 hours with a 20-km/h tail wind. The return flight against the same (answered by mananth)

An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same (answered by josgarithmetic)

An airplane flew for 6 hours with a 22-km/h tail wind. The return flight against the same (answered by checkley75)

An airplane flew for 6 hours with a 22-km/h tail wind. the return flight against the same (answered by mananth)

An airplane flew for 4 hours against a head wind of 40 km/h. On the return flight the... (answered by tutorvolunteer)

an airplane flew for 4.23 hours with a 25.5km/h tail wind. the return flight against the... (answered by richwmiller,Greenfinch)

An airplane flew for 6 hours with a tail of 60 km/hr. The return flight against the same... (answered by stanbon)