Speed Time Distance Questions - Relative Speeds, Length of trains - Ascent CAT, PGSEM, TANCET Training, correspondence courses

Ascent Education - TANCET, MBA Entrance Training Classes
 
Latest News LATEST NEWS
Ascent Success Stories
TANCET 16 Classes @ ChennaiXAT 16 Classes @ Chennai
Connector
Ascent's Courses
 
Contact Us
+91 44 4500 8484
+91 96000 48484
You are here: Home CAT Questions Speed Time Relative Speeds, Trains

Speed, Time, Distance : CAT 2016 Online Preparation

Question 4 the day : May 4, 2004
The question for the day is from the topic speed, time and distance and is about finding the distance covered by a train while crossing a stationary object whose length is comparable to the length of the train.

Question
A train traveling at 72 kmph crosses a platform in 30 seconds and a man standing on the platform in 18 seconds. What is the length of the platform in meters?
  1. 240 meters
  2. 360 meters
  3. 420 meters
  4. 600 meters
Correct Answer is 240 metres . Choice (1) is right.

Explanatory Answer

When the train crosses a man standing on a platform, the distance covered by the train is equal to the length of the train.

However, when the same train crosses a platform, the distance covered by the train is equal to the length of the train plus the length of the platform.

The extra time that the train takes when crossing the platform is on account of the extra distance that it has to cover = length of the platform.

Therefore, length of the platform = speed of train * extra time taken to cross the platform

Length of platform = 72 kmph * 12 seconds

Converting 72 kmph into m/sec, we get 72 kmph = = 20 m/sec

Therefore, length of the platform = 20 * 12 = 240 meters.


More Questions on Speed, Time and Distance

XLRI XAT TANCET Practice Question Samples



 
Quick Links
TANCET Questionbank  
TANCET MBA MCA Practice Questions with detailed explanation and shortcuts. TANCET Sample Questions

GMAT Math Books  
Comprehensive study material for GMAT Quant. 1800+ questions. GMAT Quant Books

CAT Online Course  
2IIM's Online CAT Course.Try it free

TANCET Diagnostic Test  
Free Online TANCET diagnostic test with video explanation. TANCET Diagnostic Test

GMAT Diagnostic Test  
Free GMAT Online Diagnostic Test with video explanation. Take the test!

GMAT Math Lesson Book | SAT prep | GRE Classes @ Chennai | GMAT Coaching @ Chennai | TANCET Mailing List
© 2002 - 17 ASCENT Education all rights reserved. Terms & Condition | Privacy Policy