maths

City C
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City B <------------- City A


the figure shows three cities , A, B and V. two cars, X and Y, departt from city A at the same time. Car X first goes to City B and then to City C at a speed of 98km/h, while car Y goes to city C directly at a speed of 70km/h. If the distance between cities A and B is 240km and both cars travelling time less than 5 hours, find the distance between cities B and C.