Two cars are moving in the same direction with the same speed 30 km/hr. They are separated by a distance of 5 km, the speed of a car moving in the opposite direction if it meets these two cars at an interval of 4 minutes, will be
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The two car (say A and B) are moving with same velocity, the relative velocity of one (say B) with respect to the other 
So the relative separation between them (= 5 km) always remains the same.
Now if the velocity of car (say C) moving in opposite direction to A and B, is 
relative to ground then the velocity of car C relative to A and B will be 
But as 
is opposite to v C
So 
So, the time taken by it to cross the cars A and B 
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