Question 366734
up mountain 
let distance be x km
speed = 2.4 
time = x/2.4
..
down the mountain
speed = 3.6 km/h
time = x/3.6 
...
x/2.4  +x/3.6 = 11
(3.6x+2.4x)/3.6*2.4=11
6x= 11*3.6*2.4
/6
x=11*3.6*2.4 /6
x=15.84 km .....

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m.ananth@hotmail.ca