Two boys jointly begin to write a booklet containing $817$ lines. The first boy starts with the first line and writes $200$ lines an hour. The second boy starts with the last line,then writes line $816$ and so on,proceeding backwards at the rate of $150$ lines an hour. They will meet on:

• A
  $467^{th}$ line
• B
  $466^{th}$ line
• C
  $460^{th}$ line
• D
  $472^{th}$ line