A little help of how to do these would be nice?
I’m not looking for an answer as much as how you would go about doing these questions. It seems I’m going in circles.
A ski lift takes a skier up a slope at 50 m/min. The skier then skis down the slope at 150 m/min. If a round trip takes 24 min, how long is the slope?
In the design of a bridge, an engineer determines that four fewer 18-m girders are needed for the span length than 15-m girgers. How many 18-m girders are needed?
Wow that was really simple and well put. I can’t believe I have been overlooking stuff that is just so easy; maybe I should put the book down for a bit. You must have been a great teacher back in your day =) Thanks for the help!
First – rate problem
Distance = speed x time
Let x represent the time going up in minutes
Then 24 – x represents the time going down
Distance is the same up and down
50x = 150(24 – x)
Solve
Length of span is the same for both types.
Let x represent the number of 18m girders
Then x + 4 represents the number of 15m girders
18x = 15(x + 4)
Solve
Hope this helps you to the right answers.
Roller Coaster Tycoon 3: My Ski-lift Design over water in Palm Springs
