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Topic review (newest first)
- irspow
- 2005-12-08 12:59:07
I was just browsing for interesting posts in the past and I noticed that this one was never really answered. The question asked how far the boy had walked.
let v be the velocity of the boy
D/v = t1
D/(4v/3) = 3D/4v = t2
delta t = t1 - t2
we know that delta t = 4/3 and it also equals D/v - 3D/4v
4/3 = D/v - 3D/4v
4/3 = D/4v
D = 16v/3 = 48km
- Roraborealis
- 2005-04-17 20:02:32
Oh, of course you did.
- Zach
- 2005-04-17 09:02:17
I thought that I wouldn't answer the question.
I mean, Yea.. I thought it was going to be 48. Of course.
- Roraborealis
- 2005-04-17 01:56:34
I didn't really know how to do the question.
- MathsIsFun
- 2005-04-15 17:52:11
There: 50 mi at 40 mi/h = 1.25h,
Back Again: 50 mi at 60 mi/h = 0.8333... h,
There and Back: 100 mi, taking 1.25h + 0.8333... h = 2.08333... h
Speed: 100 / 2.08333 ... = 48 mph DONE
By the use of my trusty calculator.
Who thought it should be the average of 40 and 60 = 50 mph ??
- mohit
- 2005-04-15 17:13:32
Caroline drove 50 miles to her mother's house at an average speed of 40 miles per hour, and she drove back on the same route at an average speed of 60 miles per hour. What was her average speed for the entire trip, in miles per hour?
- stewie
- 2005-04-15 05:56:17
how pathetic
- Mr T
- 2005-04-15 05:19:08
vote B4 u leave!!!
- static helper
- 2005-04-15 05:17:56
yr 9 sats time AHHHHhhh
better be going. tlk 2morrow MAYBE!! spooky, i could be dead!
- Mr T
- 2005-04-15 05:15:57
wat yr r u in.
- static helper
- 2005-04-15 05:11:01
no i was on it at school. we got shown it to do sats revision. i joined when i got home
- Mr T
- 2005-04-15 05:04:01
u joined bCoz u luv maths. weren't you a member before the E=tally=3 incident
- static helper
- 2005-04-15 05:01:36
i didnt join to make fun of you.
- Mr T
- 2005-04-15 04:59:20
its in the members only section. see i am always thinking!!!
- Roraborealis
- 2005-04-15 04:57:02
But then won't the guests vote for stewie instead of you?