Rushing to Get Home.

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Posers and Puzzles

03 May 21

~~Removed~~

Joined: 10 Dec 06
Moves: 8528

03 May 21

2 edits

A person drives from A to B to get to work at a constant speed of 30 km/hr. They were running a little late for a hot date, so they decided to rush a little bit on the way home. If the average speed the person traveled over the round trip form A to B and B to A was 55 km/hr, how fast were they traveling on the way home?

Liljo

Joined: 28 Feb 16
Moves: 4765

04 May 21

@joe-shmo
80kph

Ashiitaka

RSA

Joined: 20 Oct 16
Moves: 11569

04 May 21

@liljo said
@joe-shmo
80kph

You can't add the speeds and divide by 2 to get 55 because the amount of time taken is different for each.

venda

Dave

S.Yorks.England

Joined: 18 Apr 10
Moves: 83870

04 May 21

@ashiitaka said
You can't add the speeds and divide by 2 to get 55 because the amount of time taken is different for each.

Correct because 55 is an average itself.
I think the equations are 30+x/2 =55
30x/55= y," y " being the answer.
I'll try it later.

Mephisto2

Joined: 12 Mar 03
Moves: 44411

04 May 21

165 km/h?

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Joined: 10 Dec 06
Moves: 8528

04 May 21

Still Open

venda

Dave

S.Yorks.England

Joined: 18 Apr 10
Moves: 83870

04 May 21

@joe-shmo said
Still Open

Ok. I got the formula slightly wrong, but I have amended it and arrived at an answer.
I can only hope there were no police about when he was driving home!!

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Joined: 10 Dec 06
Moves: 8528

04 May 21

@venda

Correct!

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Joined: 10 Dec 06
Moves: 8528

04 May 21

@venda

Feel free to write up the solution if you'd like.