Register

circular track

4,903 views
2 2 votes
A B C participate in race around circular track.A and B run in same direction while C in opposite direction.if speed of A B C are 10m/s 20m/s and 30 m/s respectively and length of track is 1000 m then  after how much time they will meet for first time?

1 Answer

Best answer
1 1 vote

As Given , 

speed of A= 10m/s,  B= 20m/s , C = 30m/s 

length of track is 1000m 

as we  have find out , when all will meet first time ...so we have to calculate time taken by fastest runner over others ..

so C(30m/s fastest runner) take one round over B is  = (1000 ) / (30+20)= 20 sec (as both are in opposite direction relative speed add)

 similar C take one round over A is = (1000)/(30+10)= 25 sec.

now all will meet same first time = LCM(20,25) = 100sec ... so after 1min 40 sec , they all will meet first time

• selected by
Voting & Accepting an answer helps improve the community
← PreviousNext →
← Previous in categoryNext in category →

Related questions

1 1 vote
2 answers 2 answers
8.2k
8.2k views
Misbah Ghaya asked Aug 24, 2015
8,157 views
Rohan and Sohan start simultaneously from a point A on a circular track and run in the same direction.
Rohan and Sohan start simultaneously from a point A on a circular track and run in the same direction. The speed of Rohan is nine times the speed of Sohan. How many times...
0 0 votes
1 1 answer
2.1k
2.1k views
Lakshman Bhaiya asked Apr 1, 2020
2,141 views
NIELIT 2017 OCT Scientific Assistant A - Section A: 31
A $300$ metre long metro train crosses a platform in a metro station in $39$ seconds while it crosses a lamp post in $18$ seconds. What is the length of the platform?$250...
2 2 votes
2 answers 2 answers
7.2k
7.2k views
eyeamgj asked Jun 9, 2018
7,152 views
madeeasy work book
A plane left half an hour than the scheduled time and in order to reach its destination $1500 \hspace{0.1cm} km$ away in time, it had to increase its speed by $33.33\%$ o...
2 2 votes
1 answers 1 answer
7.5k
7.5k views
Uma Maheswari asked Jan 9, 2018
7,547 views
Time and distance
Car A left from X for Y at 9:00 a.m.Car B left from Y to X at 10:00 a.m.XY=180 km.Speed of A and B are 30 and 20 kmph respectively.Find their meeting time
1 1 vote
1 answers 1 answer
2.7k
2.7k views
Parshu gate asked Dec 10, 2017
2,657 views
Directions and Distance
Rahul facing North, walks 2.8 Km at 45° to his right. Then turns right and walks 8Km, then turns right and walks 8Km, then turns right and walks 5Km. From there he walks ...