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# In traveling from city A to city B, John drove for 1 hour at 50 mph an

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Senior RC Moderator
Joined: 02 Nov 2016
Posts: 4106
GPA: 3.39
In traveling from city A to city B, John drove for 1 hour at 50 mph an  [#permalink]

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05 Sep 2017, 10:56
00:00

Difficulty:

5% (low)

Question Stats:

90% (00:58) correct 10% (00:51) wrong based on 30 sessions

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In traveling from city A to city B, John drove for 1 hour at 50 mph and for 3 hoursat 60 mph. What was his average speed for the whole trip?

(A) 50
(B) 53.5
(C) 55
(D) 56
(E) 57.5

Source: Nova GMAT
Difficulty Level: 550

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Joined: 26 Feb 2016
Posts: 3335
Location: India
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Re: In traveling from city A to city B, John drove for 1 hour at 50 mph an  [#permalink]

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05 Sep 2017, 11:01
2
In traveling from city A to city B, John drove for 1 hour at 50 mph and for 3 hoursat 60 mph. What was his average speed for the whole trip?

(A) 50
(B) 53.5
(C) 55
(D) 56
(E) 57.5

The total distance traveled from City A to City B is 50*1 + 60*3 = 230

Since John drove for 4 hours to travel this distance,
the average speed of the whole trip is $$\frac{Distance}{Time} = \frac{230}{4}$$ = 57.5(Option E)
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Joined: 15 Feb 2018
Posts: 365
Re: In traveling from city A to city B, John drove for 1 hour at 50 mph an  [#permalink]

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17 Jan 2019, 03:38
How does this work using the harmonic mean?

$$\frac{1/50+3/60}{4}$$=$$\frac{7/100}{4}$$=57.1
Re: In traveling from city A to city B, John drove for 1 hour at 50 mph an   [#permalink] 17 Jan 2019, 03:38
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