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Without any units for either the 40 or the 4.9 , the only thing we can say for sure
is that your speed is exactly 40/4.9 , or about 8.163 length unit/time unit .

-- If the 40 is meters and the 4.9 is seconds, then
your speed is about 29.4 km/hr or 18.26 mph.

-- If the 40 is yards and the 4.9 is seconds, then
your speed is about 16.7 mph or 26.9 km/hr .

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12y ago

What else can I help you with?