第一句：When will the tour bus leave?

　　游览车什么时候开呢？

　　A: Excuse me. When will the tour bus leave?

　　请问游览车什么时候开？

　　B: In three minutes.

　　3分钟以后。

　　A: When will it get to the terminal?

　　什么时候到终点站呢？

　　B: 1: 30.

　　一点半。

　　第二句：How often does the bus come?

　　间隔多久来一趟公交车呢？

　　A: Excuse me. How often does the bus come?

　　请问多久来一趟公交车呢？

　　B: 20 minutes.

　　20分钟。

　　相关表达法：

　　What time does the tour bus leave? 旅游车什么时候出发呢？

　　观光游览车用英语说是：sightseeing bus 或者说 tour bus。