Two trains 130 m and 110 m in length are running
towards each other on parallel tracks, one at the rate of
32 km/h and another at 40 km/h. In what time will they
be clear each other from the moment they meet?
Answers
Answer:
12 seconds.
Step-by-step explanation:
Step by step explanation:
Relative speed : 32+40 = 72kmph.
covert into meter per second:72 * 5/18 =20 m/s.
distance = 130m +110m = 240m.
As , speed=distance/time,
time =speed/distance;
therefore,
t=240/20 = 12s
The answer is 12s
Step-by-step explanation:
A------> 65 kmph 55 kmph <------B.
Speed of the first train:
Let A is 65 kmph and Second Train B is 55 kmph.
They run opposite to each other, then
Relative or effective speed of the Trains become,
=65+55=120 kmph =
18
120×5
=
18
600
=
3
100
m/sec
Length of the first train is 180 m and second train is 120 m.
To cross each other, they need to cross their own length, i.e.
(180+120=300) m with effective speed
3
100
m/sec
<---------------180m-----------><-----------120m--------->
So, they will cover 300 m with speed
3
100
m/sec in 300×
3
100
=
100
300×3
=9 secs.
this is only an example of this type of questions
so this is the method.
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