What was Bill's average speed on his trip of 250 miles from New York : Data Sufficiency (DS)

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What was Bill's average speed on his trip of 250 miles from New York

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Math Expert

Joined: 02 Sep 2009

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What was Bill's average speed on his trip of 250 miles from New York [#permalink]

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28 Mar 2016, 01:23

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Difficulty:

5% (low)

Question Stats:

87% (00:33) correct

13% (00:56) wrong

based on 338 sessions

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What was Bill's average speed on his trip of 250 miles from New York City to Boston?

(1) The trip took Bill 5 hours.

(2) At the midpoint of his trip, Bill was going exactly 50 miles per hour.

Spoiler: OA

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Re: What was Bill's average speed on his trip of 250 miles from New York [#permalink]

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28 Mar 2016, 02:42

Total trip distance = 250 miles
(1) The trip took Bill 5 hours.
Average speed = Total distance / Time
= 250/5
= 50 miles per hour
Sufficient
(2) At the midpoint of his trip, Bill was going exactly 50 miles per hour
Not sufficient

Answer A
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Re: What was Bill's average speed on his trip of 250 miles from New York [#permalink]

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28 Mar 2016, 02:47

Bunuel wrote:

What was Bill's average speed on his trip of 250 miles from New York City to Boston?

(1) The trip took Bill 5 hours.

(2) At the midpoint of his trip, Bill was going exactly 50 miles per hour.

Statement 1) Speed = distance/ time = 250/5 - sufficient

Statement 2) no information on time or overall speed - not sufficient

Answer - A

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Joined: 11 Jul 2017

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What was Bill's average speed on his trip of 250 miles from New York [#permalink]

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11 Jul 2017, 22:28

Hi
I was a bit confused here. Nowhere it is mentioned that if Bill stopped on the way in his trip. How can we calculate the average speed without knowing if he stopped or not.
Please help explain?
As per me answer should be E

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Re: What was Bill's average speed on his trip of 250 miles from New York [#permalink]

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11 Jul 2017, 22:46

club750 wrote:

Does it matter whether he stopped? We are told that the entire trip took Bill 5 hours. 5 hours include the stops if there were any.
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Re: What was Bill's average speed on his trip of 250 miles from New York [#permalink]

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05 Oct 2018, 19:32

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