Two trains each of length 100m nbsp- moving parallel towards each other at speed nbsp-72km-hr and 36 km-hr respectivey - in how much time will they cross each other -

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Standard XII

Physics

Instantaneous Velocity

two trains ea...

Question

two trains each of length 100m moving parallel towards each other at speed 72km/hr and 36 km/hr respectivey . in how much time will they cross each other ?

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Solution

Total length of the train is 200 m = 0.2 km.
Now relative velocity between the train is 72+36=108 km/h.
So time to cross each other is $\frac{0.2}{108} hour = \frac{0.2}{108} \times 3600 s = 6.67 s$

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two trains each of length 100m moving parallel towards each other at speed 72km/hr and 36 km/hr respectivey . in how much time will they cross each other ?

Total length of the train is 200 m = 0.2 km. Now relative velocity between the train is 72+36=108 km/h. So time to cross each other is 0.2108 hour = 0.2108×3600 s=6.67 s

Total length of the train is 200 m = 0.2 km.
Now relative velocity between the train is 72+36=108 km/h.
So time to cross each other is $\frac{0.2}{108} hour = \frac{0.2}{108} \times 3600 s = 6.67 s$