The load-to-weight ratio of two cargo ships, A and B, is 5:2. A batch of goods is transported by Ship A, which can be finished in 6 times. If ship B is used instead, how many times will it take to finish the shipment?
甲乙两艘货船的载质量之比是5：2．一批货物由甲船来运，6次可以运完．如果改由乙船来运，多少次才能运完这批货物？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>