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Adwoa drove a distance of 288 miles from city A to city B. At what tim

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Adwoa drove a distance of 288 miles from city A to city B. At what tim  [#permalink]

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New post 13 Apr 2018, 01:07
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Adwoa drove a distance of 288 miles from city A to city B. At what time did Adwoa leave city A?

(1) Adwoa drove an average speed of 72 miles per hour.
(2) Adwoa arrived in city B at 2 p.m.

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Re: Adwoa drove a distance of 288 miles from city A to city B. At what tim  [#permalink]

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New post 13 Apr 2018, 10:55
Bunuel wrote:
Adwoa drove a distance of 288 miles from city A to city B. At what time did Adwoa leave city A?

(1) Adwoa drove an average speed of 72 miles per hour.
(2) Adwoa arrived in city B at 2 p.m.


(1) Distance = 288 miles, Average Speed for this distance = 72 miles per hour
Thus time taken to cover this distance = 288/72 = 4 hours.
Thus Adwoa took 4 hours, but this is not sufficient to know the time (in clock) when Adwoa left city A. Not sufficient.

(2) Arrival time is given, this will not help us in knowing departure time. Not sufficient.

Combining the statements,
Adwoa must have left 4 hours before 2 pm, hence Adwoa left city A at 10 am. Sufficient. Hence C answer
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Adwoa drove a distance of 288 miles from city A to city B. At what tim  [#permalink]

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New post 18 Apr 2018, 00:36
Bunuel wrote:
Adwoa drove a distance of 288 miles from city A to city B. At what time did Adwoa leave city A?

(1) Adwoa drove an average speed of 72 miles per hour.
(2) Adwoa arrived in city B at 2 p.m.


Given: Distance = 288 kms from city A to B.

We need :
1. Time taken to cover the distance
2. Time when Adwoa reached city B.


St 1: Only give us time taken to cover the distance. Insufficient

St 2: Only give us time when Adwoa reached city B. Insufficient

Combining 1 and 2 we get both informations

(C)
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Re: Adwoa drove a distance of 288 miles from city A to city B. At what tim  [#permalink]

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New post 18 Apr 2018, 02:15
The correct answer is C. The reasoning is given below.
The question states that Adwoa drove a distance of 288 miles from city A to city B. At what time did Adwoa reach city B?
(1) tells us that the average speed is 72 miles per hour. However, time of departure is missing. Therefore, (1) is insufficient.
(2) tells us that Adwoa arrived in city B at 2PM.We also know that the distance covered is 288 miles but we are not aware of the speed. Therefore, (2) is insufficient.
Combining (1) and (2) together, we get that Adwoa drove 288 miles at an average speed of 72 miles per hour and reached city B at 2PM. Thus, (72*4=288) the travel time was 4 hours and Adwoa reached city B at 2PM. Therefore, 2PM - 4 hours is 10AM. Both statements together are sufficient and neither alone are sufficient. Therefore, option C is the correct answer.
Re: Adwoa drove a distance of 288 miles from city A to city B. At what tim &nbs [#permalink] 18 Apr 2018, 02:15
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