The diagram below shows 2 routes a vehicle can take to travel from town X to town Z. Two vehicles left town X at the same time for town Z, one using route A and the other, route B. Both vehicle travelled at a constant speed of 75 km/h but the vehicle using route B reached town Z 30 minutes ahead of the other vehicle. If the vehicle using route A took 4 hours to reach town Z, how long is route B?
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