A plane travels from point A for 1 hour towards the west at 400 km/h and then travels towards the north for 1 hour at 300 km/h arriving at point B A second place. Starting at A at the same time as the first plane and travelling towards B along a straight line, will arrive at B at the same time as the first plane if its speed is

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A plane travels from point A for 1 hour towards the west at 400 km/h and then travels towards the north for 1 hour at 300 km/h arriving at point B A second place. Starting at A at the same time as the first plane and travelling towards B along a straight line, will arrive at B at the same time as the first plane if its speed is