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# Carlos runs a lap around the track in x seconds. His second lap is fiv

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Math Expert
Joined: 02 Sep 2009
Posts: 49271
Carlos runs a lap around the track in x seconds. His second lap is fiv  [#permalink]

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19 Aug 2018, 09:43
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(N/A)

Question Stats:

60% (00:55) correct 40% (01:22) wrong based on 9 sessions

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Carlos runs a lap around the track in x seconds. His second lap is five seconds slower than the first lap, but the third lap is two seconds faster than the first lap. What is Carlos’s average (arithmetic mean) number of minutes per lap, in terms of x?

(A) $$x - 1$$

(B) $$x + 1$$

(C) $$\frac{x-1}{60}$$

(D) $$\frac{x+1}{60}$$

(E) $$\frac{x+3}{60}$$

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Joined: 20 Feb 2015
Posts: 733
Concentration: Strategy, General Management
Re: Carlos runs a lap around the track in x seconds. His second lap is fiv  [#permalink]

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19 Aug 2018, 09:50
Bunuel wrote:
Carlos runs a lap around the track in x seconds. His second lap is five seconds slower than the first lap, but the third lap is two seconds faster than the first lap. What is Carlos’s average (arithmetic mean) number of minutes per lap, in terms of x?

(A) $$x - 1$$

(B) $$x + 1$$

(C) $$\frac{x-1}{60}$$

(D) $$\frac{x+1}{60}$$

(E) $$\frac{x+3}{60}$$

lap 1 => x seconds
lap 2 => x+5 seconds
lap 3 = > x-2 seconds

mean = (3x+3)/3 = x+1 seconds = (x+1)/60 minutes
Re: Carlos runs a lap around the track in x seconds. His second lap is fiv &nbs [#permalink] 19 Aug 2018, 09:50
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