Santa Claus sometimes helps the elves by making some toys. He’s not so fast as the elves, but he can still make 30 toys each hour. In order to keep from getting bored he starts each day by building 50 trains and then switches to building 50 aeroplanes. Then he switches back to trains and keeps switching back and forth until the day is finished. If Santa starts work at 8:00am, when will he finish his 108th train?
Answer
Because Santa started with trains, the 108th train will occur during his 5th batch of toys. Thus he will have built a total of 208 toys. At 2 minutes a toy, his 108th train will happen 416 minutes after he has started work, which is 2:56pm.