(i) Yes, India needs to have more than one standard time. This is because its east-west extension of India is nearly 30 degrees (2933 kms), and there is a difference of about two hours in the time of its eastern and western ends. Some countries have more than one standard meridian due to their vast east-to-west extent. For example, the USA has seven time zones.
(ii) India's long coastline (7,517 km) gives several advantages to the country. The trans-oceanic routes connecting Africa, Europe, China, Japan, Australia and western coast of the USA pass through Indian Ocean.
(iii) The latitudinal spread of India is advantageous because it gives large variety of landforms, climate, soil types and natural vegetation in the country.
(iv) Watches-at Kohima and New Delhi show the same time because Indian Standard Time is calculated on the basis of 82.5° E longitude and watches all over India are set accordingly.
(i) (b) 8°4'N - 37°6'N
(ii) (a) Bangladesh
(iii) (a) China
(iv) (b) 82°30'E
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