Correct Option: C

zero (0) degree Longitude is the mean longitude and the time adjusted according to this longitudinal time. The earth rotates from West to East. So every 15 o we go easy wards, local time is advanced by 1 hour. If we go west wards, local time is retarded by 1 hour. Each country has set their local time multiple of half an hour (1/2 hour). India’s local standard time is (+5.5 h). Means 5.5 h ahead of G.M.T.