Your correct in saying 1 byte = 8 bit. However, 3072 Megabytes must first be converted to bits, so that then we can find the amount of Megabits. So, 3072 MB = 3072 megabyte = 3072*8 mb (megabit), is not true.(Assuming you're talking about Question 30 (b) (ii)) How did people get 61? (Caveat, I don't do General Maths though, so I might have missed something.) Note that 1 byte = 8 bit. So 3072 MB = 3072 megabyte = 3072*8 mb (megabit).

Therefore, the speed in megabit per second required (noting 7 min. = 420 s) is

(3072*8 mb)/(420 s) = 58.51429... mbps, which is 59 to the nearest whole number.

The correct working is:

3072 MB (Megabytes) * 1024 *1024 * 8 = 2.576980378x10^10 b (bits).

2.576980378x10^10 bits/1000x1000 = 25769.80378 mb (Megabits)

Therefore, 25769.80378/Mbps = 420

Rearranging this gives us 61.356675.....Mbps

Which is 61 Mbps to nearest Mbps.

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