Answer the following questions:
1. An important programme was to be broadcast from Mumbai at 7:30 p.m. This was heard by
some Indian sailors near Ivory Coast in West Africa at 20°W longitude. What was the local time
there?
2. What is the longitude of a place where the local time is 1:15 p.m., when it is 4 a.m. at Chicago
(88"W)?
3. Calculate the time at Durban (longitude 30°E) when the time is 7:00 a.m. at New York (75°W).
4. Calculate the longitude of a place where the local time is 6:00 a.m., when the time is 9:00 p.m.
at New Delhi on longitude 77°E.
5. Calculate the local time at Singapore (104°E) when it is 6:00 p.m, at Greenwich.
6. Calculate the location of a place where the local time is noon when it is 7:30 p.m. at Greenwich.
7. What is the time and day at Mumbai (73°E) when it is Sunday 10:30 p.m, at Shillong (92°E)?
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Answers
Answer:
1. In terms of time zones, the country is exactly 5 hours and 30 minutes behind in time. E.g. if it's 5:30 am in India, it will be 12:00 am in Ivory coast. For this question, since the program is being aired at 7:30pm from Mumbai, the Indian Sailors in Ivory coast can check it out at 2:00pm, Ivory coast time.
2. The time difference between the two places is 9 hours and 15 minutes or 540 + 15 = 555 minutes So the longitudinal difference will be 555/4 = 138.75° degrees.
West = 75° and East = 30°
So, west+east = 75°+30°=105°
3.1°latitude makes a difference of 4 minutes.
Difference between two places = 105× 4=420 minutes or 420/60 =7hours.
Answer will be 7p.m.
4.The time difference between the required place and New Delhi is 6 + 9 = 15 hours, so the time in minutes =15 × 60 = 900 minutes So the longitudinal difference = 900/4 = 225°.
5.Calculating the time it takes to move a degree will be 60/15= 4 minutes). To know how much time Singapore is ahead of GT= 104 * 4= 416 minutes or 6 hours 56 minutes. It is given that the time is 6:00 pm in Greenwich, as Singapore is 6 hours and 56 minutes ahead of GT, local time in Singapore will be 12:56 pm.
6.If at Greenwich the is 7:30 pm then in its west side will be the noon so 12 noon time will at 4:30 hours distance from Greenwich that will be at 67.5 degree west.
7.The longitudinal difference is 92° – 73° = 19°. So the time difference is 19 x 4 = 76 minutes or 1 hours 16 minutes or the time at Mumbai is 9.14 p.m.
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Answer:
Ans 1) The local time there would be 2:00