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# Two microphones are located 100 meters apart and each is 130 meters

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Math Expert
Joined: 02 Sep 2009
Posts: 43804
Two microphones are located 100 meters apart and each is 130 meters [#permalink]

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03 Aug 2017, 07:51
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Difficulty:

25% (medium)

Question Stats:

94% (00:53) correct 6% (01:49) wrong based on 38 sessions

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Two microphones are located 100 meters apart and each is 130 meters from the same listening station. If a transmitter is located half-way between the two microphones, what is the distance, in meters, between the transmitter and the listening station?

(A) 120
(B) 124
(C) 125
(D) 128
(E) 130
[Reveal] Spoiler: OA

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Joined: 06 Nov 2016
Posts: 100
Location: India
GMAT 1: 710 Q49 V37
GPA: 2.8
Re: Two microphones are located 100 meters apart and each is 130 meters [#permalink]

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03 Aug 2017, 08:06

You can draw an isosceles triangle with the base formed using two microphones (100 m) and the other two sides as 130 m (top vertex is the listening station)
transmitter is in the middle of base.

So applying pythagoras,
5,12,13 triangle

distance is 120
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Joined: 26 Feb 2016
Posts: 2048
Location: India
GPA: 3.12
Two microphones are located 100 meters apart and each is 130 meters [#permalink]

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03 Aug 2017, 08:58
Since the microphones are located 100 m apart and
the transmitter is located halfway between the microphones,
distance between the microphone and the transmitter is 50m.

The microphone is around 130 meters from the listening station.
Since we are asked the distance between the listening station and the
transmitter, let that distance be x.

Apply Pythagoras theorem to the right angled triangle
formed between the microphone, the transmitter and the listening station

$$x^2 + 50^2 = 130^2$$
$$x^2 = 16900 - 2500$$
$$x^2 = 14400$$
$$x = 120$$ (Option A)
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Two microphones are located 100 meters apart and each is 130 meters   [#permalink] 03 Aug 2017, 08:58
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