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The Mega- prefix means a million (1,000,000 = 10^6) → 1 Ms = 1,000,000 s → 20 s = 20 ÷ 1,000,000 Mg = 0.00002 Ms = 2 × 10^-5 Ms.
1 nanoseconds = 1 nanoseconds. And that is the decimal form of a nanoseconds in nanoseconds. It can also be written as 1000 picoseconds or 0.000000000000001 megaseconds but such representations depend on what unit is being used. None has been specified in the question.
1 minute 32 seconds - 48 seconds = 92 seconds - 48 seconds = 44 seconds
820 seconds is always 820 seconds
One minute is 60 seconds. To figure out how many seconds are in 1 minute and 43 seconds, add 60 seconds to 43 seconds to get your answer.