Lizzy: William left Missouri by 7:00 AM and arrived at his hometown by 8:00 PM. He had 3 stops of 25, 10 and 25 minutes respectively during the journey. How many hours did he spend on the road?.
Me: Hmmm, let me think. I think this is the detailed solution:
8:00 PM is equivalent to 20:00 hrs so he spent a total of 20 - 7 = 13 hours on the journey. He spent 25 + 10 + 25 = 60 minutes on stops. There are 60 minutes in an hour so he spent (60 / 60) = 1 hour on stops. Therefore, he spent 13 - 1 = 12 hours on the road. Final answer: 12.