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Towns X is 3600 km to the west of Town Y.

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Intern
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Joined: 16 Oct 2011
Posts: 16
Location: United States
Schools: Haas EWMBA '23
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Towns X is 3600 km to the west of Town Y.  [#permalink]

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New post 10 Aug 2019, 15:13
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Difficulty:

  55% (hard)

Question Stats:

36% (02:10) correct 64% (03:39) wrong based on 11 sessions

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Towns X is 3600 km to the west of Town Y. An Airline operates non-stop flights between X and Y. Its schedule is tabulated as below. The given time is the local time on the same day.

Departure from Town Y at 4.00PM and Arrival at Town X at 7.30 PM
Departure from Town X at 3.00AM and Arrival at Town Y at 1.30 PM

The planes cruise at the same speed in both directions. However, a steady wind blows from Y to X at 75 KMPH. The effective speed of each plane is affected by this.

Find the time difference between X and Y.

A) 2 hrs
B) 2.5 hrs
C) 3 hrs
D) 4.5 hrs
E) 1.5 hrs
Director
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Joined: 19 Oct 2018
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Towns X is 3600 km to the west of Town Y.  [#permalink]

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New post 10 Aug 2019, 16:38
1
Assume there is x hours time difference between town X and town Y, and v is speed of airplane.

For trip from Y to X
\(\frac{3600}{3.5+x}\)=v+75......(1)

For trip from X to Y
\(\frac{3600}{10.5-x}\)=v-75........(2)

subtract equation (2) from (1), we get
\(\frac{3600}{3.5+x}\)- \(\frac{3600}{10.5-x}\)=150

\(\frac{24}{3.5+x}\)- \(\frac{24}{10.5-x}\)=1

Either we can make a quadratic equation and find the roots, or we can check which option satisfies our equation. Later approach is quicker tho.

At x=2.5
\(\frac{24}{3.5+2.5}\)- \(\frac{24}{10.5-2.5}\)=1

\(\frac{24}{6}\)- \(\frac{24}{8}\)=1
4-3=1
1=1

B

pathy wrote:
Towns X is 3600 km to the west of Town Y. An Airline operates non-stop flights between X and Y. Its schedule is tabulated as below. The given time is the local time on the same day.

Departure from Town Y at 4.00PM and Arrival at Town X at 7.30 PM
Departure from Town X at 3.00AM and Arrival at Town Y at 1.30 PM

The planes cruise at the same speed in both directions. However, a steady wind blows from Y to X at 75 KMPH. The effective speed of each plane is affected by this.

Find the time difference between X and Y.

A) 2 hrs
B) 2.5 hrs
C) 3 hrs
D) 4.5 hrs
E) 1.5 hrs
GMAT Club Bot
Towns X is 3600 km to the west of Town Y.   [#permalink] 10 Aug 2019, 16:38
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Towns X is 3600 km to the west of Town Y.

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