Question

Sandra walked to the top of a hill at a speed of 2 km/h, turn around and walked down the hill at a rate of 4 km/h. the whole trip took 6 hours. how many kilometres is it to the top of the hill?

Answer 1

D is distance. 
d/2 + d/4 = 6 
3d/4 = 6 
d = 8 km 

Check: at 2 k/h, 4 hours; 
at 4 k/h, 2 hours; 
total, 6 hours. hope i helped