Q:

My brother said, "I can climb this hill in less than an hour."

• 1
  My brother claimed that he can climb this hill in less than an hour.
• 2
  My brother claimed that he could climb that hill in less than an hour.
• 3
  My brother claimed that he can climb that hill in less than an hour.
• 4
  My brother claimed that he could climb this hill in less than an hour.