Question: 28. Two planes are flying towards the same point. The first is going to the east and the other to the north. The first

28. Two planes are flying towards the same point. The first is

28. Two planes are flying towards the same point. The first is going to the east and the other to the north. The first goes at a speed of 450km/h and the other at 600km/h. When the two planes are at 150km and 200km respectively from the collision point, at what rate is the distance between them changing?

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