The water supply company needs to lay 60-meter-long water pipes, but now there are only two kinds of water pipes, 3 meters and 5 meters. In order not to waste them, how should these water pipes be used? (Please write down all the solutions you think of)
自来水公司要铺设60米长的水管，现只有3米和5米的两种水管，为了不浪费，应该怎样用这些水管？(请把你想到的方案都写下来)
<result>5</result>