Posted by Rezu on Thursday, March 29, 2012 at 7:16pm.
Elizabeth visits her friend Andrew and then returns home by the same route. She always walks 2km/h when going uphill, 6km/h when going downhill and 3km/h when on level ground. If her total walking time is 6 hours, then what is the total distance she walks in km?
She walks 18km in total.

Math (Grade 9)  Steve, Friday, March 30, 2012 at 10:41am
using u,d,f for uphill, downhill, flat distances on the outward journey,
recall that time = distance/speed
she walks 9 km in each direction
(u/2 + f/3 + d/6) + (d/2 + f/3 + u/6) = 6
2u/3 + 2f/3 + 2d/3 = 6
u + f + d = 9
you are correct. the round trip is 18 km.
Answer This Question
Related Questions
 Math  Elizabeth visits her friend Andrew and then returns home by the same ...
 algebra  Marlene rides her bycicle to her friend Jon's house and returns home ...
 math  Erica's average rate going uphill was 80% of her average rate going ...
 Math  Sigourney Weaver's average rate going uphill was 80% of her average rate ...
 math  Jack and Jill run 10 kilometers. They start at the same point, run 5 ...
 h.s. physics  In putting, the force with which a golfer strikes a ball is ...
 science  Jay is going to school. To reach the school, Jay need to go 3km going ...
 science  Jay is going to school. To reach the school, Jay need to go 3km going ...
 @elena  i noticed you helped a lot of people with their questions with physics...
 Math  A train goes twice as fast downhill as it can go uphill, and 2/3 as fast ...
More Related Questions