A and B ride bicycles from A to B at the same time and meet each other in 4 hours. If they each travel 5 kilometers per hour more than the original speed, they will meet in 3 hours. How many kilometers are the distances between A and B?
甲乙二人骑车同时从A，B相向而行，4小时相遇，如果两人各自比原定速度每小时多走5千米，则3小时相遇，A，B两地相距多少千米？
<gadget id="calculator">5 * 2 * 3</gadget>
<output>30</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<result>120</result>