Roblox Code

--define variables
local time = 0
local speed
local T = false
--functions, and other events
function Igate(state)
    if state then
        workspace.C.CanCollide = true
        print("Locked")
    Else
        workspace.C.CanCollide = false
    End
End
script.Parent.B.Touched:Connect(function(
    T = true
    Igate(true)
)end
script.Parent.B.Touched:Connect(function(
    T = false
    Igate(false)
    Calculate()
)end
while true do
    while T do
        wait(1)
        time = time + 1
    end
end

function Calculate()
    speed = time / --distance
    print(speed)
end