CLEAR
Toprankers-Info

+91 7676564400

Mobile App

Get it on Google Play
Discussions
Select Date
Tags:

Articles

Discussions
Submit Discussion
RKP

· started a discussion

· 1 Months ago

.....................doubt (Question:586714.0)

speed of faster train is average of both, how?????????

Question:
Two trains, each 100 m long, pass each other on parallel lines. If they are going in the same direction, the faster one takes one minute to pass the other completely. If they are going in different directions, they completely pass each other in 3 seconds. Find the speed of faster train in kmph.
Options:
A) 95.5 kmph         
B) 99.5 kmph
C) 126 kmph
D) 120.7 kmph
Solution:

R1 = \(\cfrac{100+100}{60}\) = \(\cfrac{200}{60}\)= \(\cfrac{10}{3}\) R2 = \(\cfrac{100+100}{3}\) = \(\cfrac{200}{3}\) m/s

Speed of faster train = \(\cfrac{\cfrac{10}{3}+\cfrac{200}{3}}{2}\) = \(\cfrac{210}{6}\) = \(\cfrac{105}{3}\)

\(\cfrac{105}{3}\) × \(\cfrac{18}{5}\) = 126 kmph.

-logo
We at aim to provide most comprehensive content & test for practice which is carefully divided into various chapters and topics to help you focus on your weak areas.Our Practice mock test gives you unmatched analytics to help you realize your strong areas,time management and improvement areas.Our Short & Crisp notes on each topic will help you to quickly revise the topic along with the tips & tricks of the exams.
More About
-Info
-Info

Mobile App

Get it on Google Play
About Us Campus Ambassador Careers Contact Us Refund Policy

All Rights Reserved Top Rankers

User Policy
Disclaimer
Terms & Conditions