On Arriving Early
Bob always arrives at the train station at exactly five o'clock to pick up his wife Betty and drive her home. One day Betty arrives an hour early, and starts walking home, and is eventually picked up. Betty arrives home twenty minutes earlier than usual.
How long did she walked, before she met her husband ?
How long did she walked, before she met her husband ?
Labels: mathemagic, thinktank
posted by Rajesh Lal at
8:28 PM
18 Comments:
The puzzle cannot be solved with the information given.
You're right, we need to know how long it takes bob to drive, or what time they arrive usually
"I cannot solve the puzzle with the information given"
I think this should be the comment of the above two guys also
it's easy. Bob didn't have a husband since the question asked how long did she walk before she met HIS husband.
So she walked until her husband picked her up. end of story!
Helen what are you talking about i think it was typo
She didn't walk at all before she met her husband. She drove herself everywhere before she met him.
I say 20 minutes;
Since dude ALWAYS picks her up at the same time and place, he could not have seen her walking, as he wouldn't have been en route until neccessary (she left an entire hour early). This would place him at the station at 5, as always, whilst she was however far from the station since she embarked early. She was eventually picked up, NOT by Bob, and made it home early. Dummy finally figured out chick was M.I.A., so he high-tailed it home. THAT, says I, is when she finally met him.
"How long did walked before she met her husband."
One its not a question, and two you can't walked anywhere
sorry.....
20 minutes plus the time it took him to get home
It took her 40 minutes to walk home, so at 5 km an hour its about a 4 km walk. So assuming the husband just leaves home to pick up his wife and do nothing else he wouldn't leave home till about 5 minutes to 5pm. So she gets home at 4:40pm (20 mins early) and he hasn't left home yet so I guess she walked 40 minutes before she met her husband at home.
Dudes it can not be solved or you can say it has multiple answers. It can just tell you that the answer can not be 40min. It can be anything less then lets say 39.40min. He could have picked her up after 5 sec of driving around the corner (answer would be 39.50min)or 10min (answer would be 20min) and so on. All depends on how long does it take the hubby to go to the station so we could have more precise answer.
Bob saved 20 minutes on the round trip, because he picked up Betty part of the way home. This saved 20 minutes is usually spent driving from the point, where he met Betty, to the station and back. Half of this 20 minutes - 10 minutes - would have been spent driving from the pick-up point to the station. Since Bob always gets to the station at 5, he picked up Betty at 4:50. So Betty walked for 50 minutes.
Because the driving speed is only five times the walking speed, Betty is a very fast walker or Bob is a very slow driver...
This is a perfect or semi-perfect case of an adulterous affair. She arrives an hour early so she can meet up with her other boyfriend. In order to prevent rumors from starting, she walks to an undisclosed area, where her fling is waiting for her. They spend some time with each other and then gets dropped of at 5pm. At this time, she phones her husband and tells him that she came out early from work and made it home ok. That gives her 20 minutes to to clean her self up.
lol i like antunez's post, the most creative.
she walked for forty minutes end of, her house is forty minutes away
simple
that last one was me i dont wana be anonymous
The lady walked for 20 minutes
because when the husband left as he does the same time every day, he picked her up after driving 20. 20 minutes out equils 20 minutes back. so a total of 40 minutes of driving. 60 minutes - 40 minutes = 20 minutes which is how much earler she got home. so it all works out.
~Mateo~
50 minitues
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