The speed of a train is 120km/hr and the speed of another train is 140km/hr. So find the distance 1minute before they are colliding
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Assuming they're actually going towards each other, it's the same as if one of them is stationary while the other is moving 120+140 = 260 kilometer per hour, right?
no actually both of the trains are moving in the opposite direction and on the same track
Of course they're moving in opposite directions, but if what you mean is like this...|dw:1378212194801:dw|
then of course, they'd never collide ...
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I'm sure this is what they mean by 'opposite directions':
ya u got it right
Well then, there's a physics thing (yes, Physics.... ) called 'relative velocity', the velocity of a body relative to another.
The relative velocity of one train with respect to the other is 260 km/hr.
Now, upon collision, their distance is 0 km.
In one minute, the distance is x.
So... Distance is equal to velocity times time.
You know the velocity (speed) you know the time (one minute) just plug in .
First we think the d = 2800 km
Now we have :|dw:1378215943814:dw|
So they come 140+120 = 260 km in 1hr
can we do it in this way
distance covered in 1m =120/60km=2km 140/60=7/3km
total distance between the trains =2