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An express train traveled at an average speed of 100

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Director
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An express train traveled at an average speed of 100 [#permalink] New post 25 Nov 2007, 20:00
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

65% (04:20) correct 35% (02:30) wrong based on 74 sessions
An express train traveled at an average speed of 100 kilometers per hour, stopping for 3 minutes after every 75 kilometers. A local train traveled at an average speed of 50 kilometers, stopping for 1 minute after every 25 kilometers. If the trains began traveling at the same time, how many kilometers did the local train travel in the time it took the express train to travel 600 kilometers?

a. 300
b. 305
c. 307.5
d. 1200
e. 1236
[Reveal] Spoiler: OA
Director
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 [#permalink] New post 25 Nov 2007, 20:05
ok i figured it out..just got impatient..
people can give a shot!
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Director
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 [#permalink] New post 25 Nov 2007, 20:13
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Time for express train to travel 600 km =

600km/100kmh = 6 hours
600km/75 = 8 (7 stops + 1 for crossing the finish line)

total time = 6 hours 21 minutes

Distance traveled by local train in 6 hours 21 minutes:

300 km in 6 hours 12 minutes (6 hours of travel, 12 stops at 1 minute each)

so how far will it go in last 9 minutes?

9/60(50) = 9(50)/60 = 450/60 = 7.5

307.5 km in 6 hours 21 minutes

Answer: C
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Re: An express train traveled at an average speed of 100 [#permalink] New post 26 Nov 2013, 06:49
Hello from the GMAT Club BumpBot!

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Re: An express train traveled at an average speed of 100   [#permalink] 26 Nov 2013, 06:49
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