cashiers helping a line of customers

cashiers.rb

def all_times employees
 employees.collect {|employee| employee[:time_working]}
end

def helped_by cust_num, employees
  employees.each do |employee|
    if employee[:cust_helped].include? cust_num
      puts "#{employee[:name].capitalize} helped customer ##{cust_num}."
      puts "\n"
    end
  end
end

def sort_cust customers, employees
  (0..customers-1).each do |customer|
    employees.each do |employee|
      if employee[:time_working] == all_times(employees).min
        employee[:time_working] += employee[:min_per_cust]
        employee[:cust_helped] << customer+1
        break
      end
    end
  end
end

def pretty_time minutes

  if minutes < 60
    mins = minutes
  elsif minutes/60 >= 1
    hours = (minutes/60).floor
    mins = minutes-hours*60
  end

  time = "#{hours ||= 0} hour(s), #{mins} minutes"

  return time
end

#although it's more work, i chose hashes instead of arrays for readability and for practice with hashes :)
employees =  [{:name => "mary",  :min_per_cust => 6,   :time_working => 0, :cust_helped => []},
              {:name => "patty", :min_per_cust => 7.5, :time_working => 0, :cust_helped => []},
              {:name => "molly", :min_per_cust => 5,   :time_working => 0, :cust_helped => []},
              {:name => "tom",   :min_per_cust => 10,  :time_working => 0, :cust_helped => []}
  ]

print "How many customers are there?: "
customers = gets.chomp.to_i

sort_cust(customers, employees)

puts "\n"
puts "All the customers were helped in #{pretty_time(all_times(employees).max)}"
puts "\n"

if customers > 0
  print "Enter a customer's place in line and I will tell you who helped him/her: "
  response = gets.chomp.to_i
  helped_by(response, employees)
end