MB and Mbps look similar, but they describe different things. MB usually means megabytes, a file size. Mbps means megabits per second, a transfer speed.
Use Bytes to Bits, Bits to Bytes, Megabytes to Gigabytes and Gigabytes to Megabytes when comparing files and transfers.
Bytes and bits are not the same
One byte is eight bits. That is why a 100 Mbps connection does not download 100 MB every second in normal file-size terms.
Speed is only part of download time
Wi-Fi quality, server limits, congestion and protocol overhead can all reduce the real speed you see.
Use consistent units
Before estimating download time, convert file size and speed into compatible units. Otherwise the result can be off by a large factor.
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