conversations.from: human
conversations.value: This math problem has got me stumped: At peak hours, 11 am - 1 pm and 5 pm - 6 pm, the local fast-food restaurant serves 12 cars every 15 minutes.  Off-peak times, they serve 8 cars every 15 minutes.  From 4 pm - 6 pm, how many customers do they serve?
  Can you show me the way?
conversations.from: assistant
conversations.value: 5 pm-6 pm is one hour and they measure service in 15-minute blocks so 60/15 = 4 15 min blocks
  At peak times, they serve 12 cars every 15 minutes so they serve 12*4 = 48 cars in 60 minutes
  Off peak times, 4pm-5 pm, they serve 8 cars every 15 minutes so they serve 8*4 = 32 cars in 60 minutes
  From 4pm-5 pm they serve 32 cars and from 5pm-6 pm they serve 48 cars so they serve 32+48 = 80 cars