question: At which restaurant did the students spend the least amount of time? List restaurant and the time students spent on in total.
#1 return restaurants 
#2 return time students  spent in #1 
#3 return sum of  #2 for each  #1 
#4 return #1 where #3 is  highest 
#5 return time students  spent in #4 
#6 return sum of  #5 
#7 return #4 ,  #6