If M is the grandmother of F, which symbol should replace the question mark (?)? F × R S ? M

If 'rain' is called 'water', 'water' is called 'road', 'road' is called 'cloud', 'cloud' is called 'sky', 'sky' is called 'sea', and 'sea' is called 'path', where will an airplane fly?

If 'book' is called 'clock', 'clock' is called 'bag', 'bag' is called 'dictionary', and 'dictionary' is called 'window', what will be used to carry books?

Ajay leaves for the bus stop 15 minutes earlier than on regular days. It takes him 10 minutes to reach the bus stop from home. He reaches the bus stop at 8:40 a.m. At what time did he normally leave home?

A father tells his son, 'When you were born, I was as old as you are now.' If the father's present age is 36 years, what was the son's age 5 years ago?