Q:

A postman starts delivering letters 3 km southwards and then turns right. He covers 4 km on this road and again turns right. He delivers letters for 3 km and completes his daily beat. Then, he turns left for lunch at home, which is 5 km away. How far has he to travel to reach the post-office after lunch? 

• 1
  9 km
• 2
  8 km
• 3
  15 km
• 4
  10 km