what will be the time in japan located at 135 degree east longitude when it is 12 noon in India located at 75 degree east longitude?
Answers
Note an important fact from Hank Wisniewski’s answer, which some misguided soul downvoted: the result is not what your teacher presumably wanted. I suspect he wanted you to calculate based on the longitudes (thus the multiples of 15°), and presumably he wanted you to say 16:00.
As Hank says, the longitudes are irrelevant. The Indian time zone (IST) has an offset from UTC of 5½ hours. Japan (JST) has an offset of 9 hours. Neither observe DST. So any part of Japan is always 3½ hours ahead of India, and the correct answer is 15:30.
India can also be at 97° E, and Japan can also be at 129° E. That makes no difference to the time in either place, but the simplistic longitude calculation would give you a time of 14:08 in this case.
Each degree longitude equates to a 4 minute time difference. So the calculation is:
135 degrees - 75 degrees = 60 degree difference
60 degrees x 4 minutes = 240 minutes
240 minutes = 4 hours
12 hours + 4 hours = 16:00 or 4:00PM in Japan