Atevery bus station, busses depart at a rate of 3 every 10 minutes. At this rate, how many buses would you expect to depart in one hour?

Rate of 3 every 10 minutes.In 10 minutes there are 3 buses.In  1 minute    it is        (3/10).     For 1 hour = 60 minutes.For 60 minutes  =  3/10  * 60  =  18.18 buses.