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# What was her average speed in kilometers per hour while driving?

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Intern
Joined: 04 Nov 2019
Posts: 3
What was her average speed in kilometers per hour while driving?  [#permalink]

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09 Dec 2019, 06:25
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Difficulty:

25% (medium)

Question Stats:

77% (01:03) correct 23% (01:06) wrong based on 31 sessions

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Mr. Mike took a two-day automobile trip. What was her average speed in kilometers per hour while driving?

(1) She drove 300 killmeters the first day and 267 killometers the second day.
(2) She drove exactly one hour longer the first day than she did the second day.
Director
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Joined: 27 Oct 2018
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Location: Egypt
GPA: 3.67
WE: Pharmaceuticals (Health Care)
Re: What was her average speed in kilometers per hour while driving?  [#permalink]

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09 Dec 2019, 06:52
The given only says that the trip is taken in two stages, but don't tell how many hours did Mr.Mike drive in each day.
Average speed = $$\frac{Distance1 + Distance2}{Hours1 + Hours2}$$

from statement (1), We know Distance1+Distance2, but we don't know the value of Hours1+hours2
from statement (2), We know that Hours1 = Hours2 + 1, but still but we don't know the value of Hours1+hours2

After combining , we still don't know the value of Hours1+hours2
E
Senior Manager
Joined: 13 Feb 2018
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GMAT 1: 640 Q48 V28
What was her average speed in kilometers per hour while driving?  [#permalink]

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09 Dec 2019, 08:47
We have to solve
$$\frac{[1st day km+2nd day km]}{[1st day hours+2nd day hours]}$$

1 stm --> gives the total km driven, but we dont have an idea about the time. Not suff
2 stm --> does not even give the total time, we just know that on the first day he just drove 1-hour longer. Not suff

TOgether not sufficient as we dont know the total time

IMO
Ans: E
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Re: What was her average speed in kilometers per hour while driving?  [#permalink]

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09 Dec 2019, 11:17
Casey1985 wrote:
Mr. Mike took a two-day automobile trip. What was her average speed in kilometers per hour while driving?

(1) She drove 300 killmeters the first day and 267 killometers the second day.
(2) She drove exactly one hour longer the first day than she did the second day.

Speed is
Total distance/total time
combine both
$$\frac{D1 +D2 }{t1+t2}$$

we combine both stmts also but we still get
$$300+267/\frac{300}{t1} + \frac{267}{t1-1}$$
still t1 is an unkown
hence E
Re: What was her average speed in kilometers per hour while driving?   [#permalink] 09 Dec 2019, 11:17
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