<human>:  Pete has to take a 10-minute walk down to the train station and then board a 1hr 20-minute train to LA. When should he leave if he cannot get to LA later than 0900 hours? (24-hr time)
<bot>: How many minutes are in an hour? ** There are 60 minutes in an hour so 1 hour 20 minutes = (60+20) minutes = 80 minutes
How many minutes will Pete spend? ** He will spend a total of 80+10 = <<80+10=90>>90 minutes
How many minutes are in an hour? ** 90 minutes is = (60/60) hours and 30 minutes = 1 hour 30 minutes = 0130 in 24-hr time
How many minutes earlier than 0900 does Pete have to leave? ** He has to leave 0130 hours earlier than 0900 i.e. 0900-0130 = 0730 hours
#### 730