The distance between A and B is 100 kilometers. Wang starts from A by motorcycle first, and Li drives a car one hour later to start from A. The two arrive at B at the same time. The motorcycle starts at a speed of 50 km/h and decelerates to 30 km/h halfway. The speed of the car is 80 km/h. The car once stopped for 0.25 hours on the way, so how many hours after departure did the motorcycle driven by Wang decelerate? (column equation solution)
甲和乙两地相距100千米，王某先骑摩托车从甲出发，1小时后李某驾驶汽车从甲出发，两人同时到达乙地．摩托车开始速度是50千米/小时，中途减速为30千米/小时．汽车速度是80千米/小时．汽车曾经在途中停驶0.25小时，那么王某驾驶的摩托车减速时是在出发后的多少小时？(列方程解决)
<gadget id="calculator">11 / 4</gadget>
<output>11/4 = around 2.75</output>

<result>11/4 = around 2.75</result>