two automobiles separated by 10 km are moving in the same direction with the same speed of 60 km/hr. What is the speed of a van moving in opposite direction, if it meets the two automobiles at an internal of a minute?
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Since the two cars are moving in the same direction with same speed therefore relative speed between two cars is zero.
Let the relative speed of the third car be w.r.t the two cars.
Relative velocity of the third car:
(4/60)h
5km
=75km/h
Actual velocity of the third car:75−30=45km/h
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