If India adopts two time zones based on 75° E meridian for western India and 90° E meridian for eastern India, which one among the following states of eastern India will be benefited most ?

If India were to adopt a two-time-zone system with the eastern zone based on the 90° E meridian, Assam would benefit the most among the given options.

The standard meridian of a time zone dictates its official time. When a region's longitude closely matches the standard meridian, its official time synchronizes accurately with its local solar time (natural daylight). The 90° E meridian passes directly through western Assam, meaning the state's official working hours would align almost perfectly with the local position of the sun.

While a state like Manipur is further east (approx. 94° E) and currently faces a larger discrepancy from the 82.5° E Indian Standard Time, shifting to a 90° E time zone simply adjusts every eastern state's clocks by a uniform 30 minutes. Assam benefits the most because this exact shift brings its daylight alignment closest to zero error.