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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?