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# Average speed

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Manager
Joined: 03 Sep 2009
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Average speed [#permalink]

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19 Jan 2010, 01:35
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Hi,
Could anybody help me in getting the clear logic and concept behind the following question:

Q: If it took a bus 4 hours to get from town A to town B, what was the average speed of the bus for the trip?
1. In the first 2 hours the bus covered 100 miles.
2. The average speed of the bus for the first half of the distance was twice its speed for the second half.

Doubtful points:
a) Here whether the first half (as mentioned in the second statement) means exactly the distance covered in 2 hrs like the exact mid point of the journey or could be any adhoc half.
b) Average speed in the first half vs the normal speed in the second half.

Thanks in advance.

-Amit
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Re: Average speed [#permalink]

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19 Jan 2010, 06:53
amitanand wrote:
Hi,
Could anybody help me in getting the clear logic and concept behind the following question:

Q: If it took a bus 4 hours to get from town A to town B, what was the average speed of the bus for the trip?
1. In the first 2 hours the bus covered 100 miles.
2. The average speed of the bus for the first half of the distance was twice its speed for the second half.

Doubtful points:
a) Here whether the first half (as mentioned in the second statement) means exactly the distance covered in 2 hrs like the exact mid point of the journey or could be any adhoc half.
b) Average speed in the first half vs the normal speed in the second half.

Thanks in advance.

-Amit

It says "first half of the distance"

Means the total distance/2. If the distance is 200 miles then 100 miles are covered.
VP
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GMAT 1: 410 Q35 V11
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GPA: 3.84
WE: Engineering (Transportation)
Followers: 38

Kudos [?]: 564 [0], given: 70

Re: Average speed [#permalink]

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06 Feb 2013, 10:43
Can any one help one this,
http://www.beatthegmat.com/bus-speed-t56289.html
it says that answer is C, but the OA from GMAT club test says answer is E
Math Expert
Joined: 02 Sep 2009
Posts: 38828
Followers: 7717

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Re: Average speed [#permalink]

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07 Feb 2013, 01:18
Archit143 wrote:
Can any one help one this,
http://www.beatthegmat.com/bus-speed-t56289.html
it says that answer is C, but the OA from GMAT club test says answer is E

Correct answer is E.

Discussed here: if-it-took-a-bus-4-hours-to-get-from-town-a-to-town-b-what-102361.html and here: m16-75407.html

Notice that the question was edited and it now reads:

If it took a bus 4 hours to get from town A to town B, what was the average speed of the bus for the trip?

(1) In the first 2 hours the bus covered 100 miles.
(2) The average speed of the bus for the first half of the distance was twice its average speed for the second half.
_________________
Re: Average speed   [#permalink] 07 Feb 2013, 01:18
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# Average speed

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