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A tornado with estimated winds of 120 mph would be rated EF2.
A tornado with estimated winds of 100 mph would be rated EF1.
10 to 20 mph would be a slow moving tornado. A typical tornado travels at 30-35 mph.
A tornado with peak estimated winds of 100 mph would be rated F1 on the Fujita scale.
By the estimates of the Enhanced Fujita scale EF0 tornado winds start at 65 mph. However, this is only an estimate. It is rare to get direct measurements from inside a tornado. Note, however that whether or not a tornado has occurred is not defined by the wind speed, but by the manner in which it moves. A tornado is a violent vortex of wind in contact with the cloud base and the ground.
A slow-moving tornado tornado might travel at 10 mph, but a vortex with 10 mph winds would by no means be considered a tornado. The winds must be strong enough to produce damage.
There is no such thing as an E4 tornado. You most likely mean an EF4 tornado. The estimated winds for an EF4 tornado are 166-200 mph. That is equivalent to a category 5 hurricane (winds 156 mph or greater).
A tornado usually travels in between 30 MPH to 70 MPH.
It varies as different tornadoes move at different speeds. The average tornado, however, moves at about 30 mph. At this speed a tornado would travel a mile in two minutes. Some slow moving tornadoes may move at 10 mph or less. At 10 mph a tornado would travel a mile in six minutes. Some of the fastest-moving tornadoes have traveled at 70 mph. At this speed a tornado would move a mile in just over 50 seconds.
A 45 mph wind would not to much damage at all. A few tree limbs may break and some trees may fall, but that is likely the worst that will happen. Because of the lack of damage it will be difficult to verify that a tornado ocurred and the event will likely not even be counted.
That would be a tornado. But there is no evidence that speeds get close to 400 mph. The highest known winds in a tornado were just over 300 mph.
Moderate damage and estimated winds of 86-110 mph would qualify a tornado as an EF1 on the Enhanced Fujita scale.