A and B travel from A to B to do business. A rides a bicycle and travels 15 kilometers per hour. After 1.6 hours, B starts from A on a motorcycle and catches up with A after 0.4 hours. How many kilometers per hour does B travel on a motorcycle?
甲乙两人从A地到B地办事，甲骑自行车，每小时行15千米；经过1.6小时后，乙骑摩托车从A地出发，经过0.4小时追上了甲．乙骑摩托车每小时行多少千米？
<gadget id="calculator">1.6 / 0.4</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<result>75</result>