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# A man in a car observes that he can count 41 electric poles

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A man in a car observes that he can count 41 electric poles [#permalink]

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19 Aug 2015, 02:37
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58% (01:16) correct 42% (01:38) wrong based on 192 sessions

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A man in a car observes that he can count 41 electric poles in 2 minutes. If each consecutive electric pole is known to be 50 meter apart, what is the speed of the car?

(A) 61 km/h

(B) 60 km/h

(C) 61.5 km/h

(D) 60.5 km/h

(E) 82 km/h

Source : Aristotle Prep
[Reveal] Spoiler: OA

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Re: A man in a car observes that he can count 41 electric poles [#permalink]

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04 Sep 2015, 05:21
A man in a car observes that he can count 41 electric poles in 2 minutes. If each consecutive electric pole is known to be 50 meter apart, what is the speed of the car?

Distance between each pole = 50metres

41 poles are P_P_P....P = 40 intervals

Total distance = 50*40 = 2000metres = 2kms

Time = 2 mins = $$\frac{1}{30}$$ hour

Speed = $$\frac{Distance}{Time}$$ = $$\frac{2}{(1/30)}$$ = 60Kmph
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Re: A man in a car observes that he can count 41 electric poles [#permalink]

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05 Sep 2015, 05:15
Thats just plain annoying... 41 Poles means 41 intervals to me. As it seems it does not to Aristotle Prep...
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A man in a car observes that he can count 41 electric poles [#permalink]

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05 Sep 2015, 16:38
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Hi All,

This is meant to be an example of a 'fence post' problem, but the prompt is poorly-worded. Although the prompt does not state it, we're meant to assume that the car STARTS at the first pole, then drives forward at a constant speed, passing each of the remaining 40 poles. In that way, it's traveling 40(50) = 2,000 meters in 2 minutes.

2,000m/2 mins =
1,000m/1 min =
1km/1 min =
60km/1 hour

[Reveal] Spoiler:
B

While there's a decent chance that you will see this concept one time on the Official GMAT, that question will be far more clearly-worded than this prompt.

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A man in a car observes that he can count 41 electric poles [#permalink]

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Updated on: 28 Nov 2016, 11:32
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41 poles implies 40 distinct points after first pole which are 50 meters apart. So total distance 50*40 = 2000 meters for 2 minutes.
For 1 minute = 1000 meters = 1km
For 1 hour = 60Km.
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Originally posted by RMD007 on 28 Nov 2016, 11:06.
Last edited by RMD007 on 28 Nov 2016, 11:32, edited 1 time in total.
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Re: A man in a car observes that he can count 41 electric poles [#permalink]

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28 Nov 2016, 11:14
2 poles => 50m...3 poles=> 100m..i.e. n poles => 50 (n-1) m

Therefore total distance = 2000m = 2km

Time = 2 minutes

Speed = 2km/2min = 1km/min=> 60km/hour = 60kmph
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Re: A man in a car observes that he can count 41 electric poles [#permalink]

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25 Dec 2017, 13:09
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A man in a car observes that he can count 41 electric poles   [#permalink] 25 Dec 2017, 13:09
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# A man in a car observes that he can count 41 electric poles

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