Harvey's Scribepost for November 4, 2011

2.2 Apply, Question 21, page 61

Andrew drove his car 234 km from Dawson to Mayo in Yukon Territory in 3 h. Brian drove his truck along the same route at an average speed of 5km/h greater than Andrew's average speed. How much less time did Brian take, to the nearest minute?

If we divide 234km by 3h, we should get the km. We need to get Andrew's average speed because we need it to find out how long Brian took to reach the same distance.

78=234/3

So Andrew drove his truck at 78km/h.

We know that Brian drove 5km/h faster than Andrew, so he would have driven at 83km/h.

To find out how long he drove, we divide 234km by 83km.
2.819277108=234/83

Round.
2.8=234/3

Brian drove at 83km and took 2.8 hours.

We need to know how much more faster Brian was compared to Andrew. To do that, we convert the hours into minutes. To do this, multiply the hours by 60 minutes.

Andrew:
180=60*3

Brian:
168=60*2.8

Then subtract, and we have our answer.
12=180-168

Brian was 12 minutes faster than Andrew to reach the same distance.

Harvey's scribepost for September 21, 2010 5:30PM

Today for math class we went to the computer lab. What we did was go on the web site tutpup.com. Tutpup is a website where you can play fun math games against other people from all around the world. If you missed class and want to play, here's what you have to do:

Click on this:


Then you get to this screen:


Just fill out the form, putting your real year of birth and country, and telling us your password on the comments, then you see the question: "Do you have a class code?" Check yes. You'll be seeing a new bit, which should look like this:

For the Class Code, type: "spmath906" without quotes. Then click join now and you should get a confirmation that you joined successfully. So click the tutpup logo to return to the homepage, and pick a category to start playing!

One last image to show you how fun this thing is:


I pick Celdrick to do the next scribepost.