Sara and her family went on a vacation to a place which is 400 km from their house they started the journey at 9 a.m. from the house and drive the car uncovered 50 kilometre Pawan hour in the first half of the journey she maintain the same speed till she cover 200 km but decrease the speed to 40 kilometre per 1 hour for the remaining part of their journey how many hours they might take to cover the entire distance what is the difference in the time between the first and the second half of their journey
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