Wednesday

October 22, 2014

October 22, 2014

Posted by **Sioux** on Thursday, June 18, 2009 at 8:56am.

- Math -
**Reiny**, Thursday, June 18, 2009 at 9:13amI always had my students do these questions by organizing the information in a chart.

let the time take to go uphill be t hours

then the time taken to go downhill is 4-t hours

.......... Dist.....rate..time

uphill: ....15t......15....t

downhill....30(4-t) ..30...4-t

(I hope this somehow lined up)

but the distance is the same, so

15t = 30(4-t)

15t = 120 - 30t

45t = 120

t = 8/3

distance = 15t = 15(8/3)

= 40 km

**Answer this Question**

**Related Questions**

math..word problem - The road connecting two mountain villages goes only uphill ...

Algebra II - A runner completes a 16 mile trip, running 8 miles uphill and 8 ...

h.s. physics - In putting, the force with which a golfer strikes a ball is ...

@elena - i noticed you helped a lot of people with their questions with physics...

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 ...

Algebra - Given a line with a slope of 4, how does the graph of the line differ ...

math - Jack and Jill run 10 kilometers. They start at the same point, run 5 ...

Math - Sigourney Weaver's average rate going uphill was 80% of her average rate ...

physics - 1. A car is coasting backwards downhill at a speed of 3.0 m/s when ...