One needs to adjust his/her watch while going to Singapore and New York from Kathmandu, which lie in the east and west from Kathmandu respectively. Offer the valid reasoning behind this.

because of the longitude difference between the places.

Explanation:

as there any increase or decrease in longitudinal distance then there is increase or decrease in time.

longitudinal directly affect the time

answer; i do believe its (b) 12.5 years of age;