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The distance from Adelaide to Stansbury by road is how many miles long

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The distance from Adelaide to Stansbury by road is how many miles long  [#permalink]

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New post 26 Jun 2018, 05:53
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

57% (01:36) correct 43% (01:54) wrong based on 159 sessions

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The distance from Adelaide to Stansbury by road is how many miles longer than the distance from Adelaide to Stansbury by sea?

(1) If a car and a boat left Adelaide at the same time and both traveled at an average speed of 30 miles per hour, the boat would arrive at Stansbury 3 hours before the car.

(2) If a car traveled at an average speed of 60 miles per hour and a boat traveled at an average speed of 15 miles per hour, each would complete the trip from Adelaide to Stansbury in 2 hours.

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Re: The distance from Adelaide to Stansbury by road is how many miles long  [#permalink]

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New post 26 Jun 2018, 07:31
1

Solution



To find:
    • The distance from Adelaide to Stansbury by road is how many miles longer than the distance from Adelaide to Stansbury by sea

Analysing Statement 1
    • As per the information given in statement 1, if a car and a boat left Adelaide at the same time and both traveled at an average speed of 30 miles per hour, the boat would arrive at Stansbury 3 hours before the car
    • As the boat’s journey time is 3 hours less than car’s journey time, it would have covered 30 * 3 = 90 miles less distance
      o Therefore, road distance is 90 miles more than sea distance

Hence, statement 1 is sufficient to answer

Analysing Statement 2
    • As per the information given in statement 2, If a car traveled at an average speed of 60 miles per hour and a boat traveled at an average speed of 15 miles per hour, each would complete the trip from Adelaide to Stansbury in 2 hours
      o Distance travelled by car = 60 * 2 = 120 miles
      o Distance travelled by boat = 15 * 2 = 30 miles
      o Therefore, road distance is more than the sea distance by (120 – 30) = 90 miles

Hence, statement 2 is sufficient to answer

Hence, the correct answer is option D.

Answer: D
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Re: The distance from Adelaide to Stansbury by road is how many miles long  [#permalink]

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New post 03 Sep 2018, 05:45
Bunuel wrote:
The distance from Adelaide to Stansbury by road is how many miles longer than the distance from Adelaide to Stansbury by sea?

(1) If a car and a boat left Adelaide at the same time and both traveled at an average speed of 30 miles per hour, the boat would arrive at Stansbury 3 hours before the car.

(2) If a car traveled at an average speed of 60 miles per hour and a boat traveled at an average speed of 15 miles per hour, each would complete the trip from Adelaide to Stansbury in 2 hours.


Hi Brunnel, Pls explain

Why we are not considering the fact that "we dont know the speed of the Current while travelling via Sea ?"
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Re: The distance from Adelaide to Stansbury by road is how many miles long  [#permalink]

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New post 18 Sep 2019, 04:05
Statement 1:

----R----T----D
C--30---t+3---X
B--30---t-----Y

30t+90-30t=X-Y= 90 –> Sufficient

Classic GMAT equation trap; solving for an operation of two variables rather than each individual variable.
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Re: The distance from Adelaide to Stansbury by road is how many miles long   [#permalink] 18 Sep 2019, 04:05
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