Total Answers and Comments: Last Update: June 28, 2008
Submitted by : AG KANNAN distance=time*speed
when two trains are going in the same direction
speed of the two trains=300/30=10m/s ------>(1)
when two trains are going in the opposite direction
speed of the two trains=(200-100)/20=5m/s------>(2)
from the eqn 1&2
a+b=10
a-b=5 ans is a=7.5m/s,b=2.5m/s
Above answer was rated as good by the following members: wipro_written , janumaddu
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February 26, 2006 09:38:37 #3
gt_hotin Member Since: February 2006 Contribution: 1
RE: Two trains of lengths 200m and 100m if moving in ... l1 200;
spped of l1 be v1;
l2 100;
speed of l2 be v2;
200/v1+100/v2 30;
200/v1-100/v2 20;
hence
v1 8 and v2 20
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March 06, 2006 06:19:25 #4
sridhar
RE: Two trains of lengths 200m and 100m if moving in ... 200+100/(a-b) 20; a-b 15;
200+100/(a+b) 10; a+b 30;
therefore a 22.5 b 7.5
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June 19, 2006 02:58:13 #5
vkparthipan
RE: Two trains of lengths 200m and 100m if moving in ... time taken to cross to trains when moving in same directionis
so u have to add two sppeeds(200+100)/(a-b) 30in
opposite directions so u have to subtract the two speds(200+100)/(a+b) 20a-b 10a+b 15a 12.5 and b 7.5
guys don t confuse thi s is correct one..........
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July 21, 2006 01:58:57 #6
ankur kohli
RE: Two trains of lengths 200m and 100m if moving in ... wen moving in same direction
300 (x+y)30
in opp direction
300 (x-y)20
on solving for x and y v get
x 12.5 y 2.5
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July 22, 2006 06:34:54 #7
srinivas
RE: Two trains of lengths 200m and 100m if moving in ... d1 200
d2 100
if they r in same direction then relative speed is (200-100)/30 10/3 3.33
if they r in opposite direction then relative speed is (200+100)/20 300/20 15
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August 15, 2006 02:30:28 #8
AG KANNAN
RE: Two trains of lengths 200m and 100m if moving in ... distance time*speed
when two trains are going in the same direction
speed of the two trains 300/30 10m/s ------>(1)
when two trains are going in the opposite direction
speed of the two trains (200-100)/20 5m/s------>(2)
from the eqn 1&2
a+b 10
a-b 5 ans is a 7.5m/s b 2.5m/s
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September 04, 2006 14:15:29 #9
Kripal
RE: Two trains of lengths 200m and 100m if moving in ... Let Length of train 1 L1 200m Length of train 2 L2 100m
Let Speed of train 1 V1 ? Speed of train 2 V2 ?
Dont confuse with the total crossing length. Its always (200+100 300m). You can easily visualize it supposing one of the trains is not moving.
Now
Relative velocity of train 1 w.r.t train 2 when moving in same direction V1-V2 300/30 10 m/s
Relative velocity of train 1 w.r.t. train 2 when moving in opposite direction V1+V2 300/20 15 m/s
Solving for V1 & V2
we get V1 25/2 m/s 45Km/hr & V2 5/2 m/s 9Km/hr
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