Thread: metric conversion

Convert the following values to metric. Show all steps + cancellations:

0-60 mph in 10.5 s
113 mph (miles per hour)
14 mpg (miles per gallon)

thanks.

There is about 1.6km in 1 mile, so -

(1) 0 - 60 mph in 10.5s becomes 0 - (60X1.6)km/h in 10.5s which is:

0 - 96km/h in 10.5s

(2) 113mph = 113 X 1.6 km/h = 181km/h

There are 4.54 litres/gallon, so -

(3) 14mpg = 14 x 1.6 km/gallon = (14 x 1.6)/4.54 km per litre = 4.9 km/litre

However, fuel efficiency in metric is generally looked at in the opposite way:

4.9 km/l = (1/4.9) litres/km or in a more useful (100/4.9) litres per 100km = 20.4 l/100km

Edit: I just realised that the US gallon is a different size to the British gallon, so you may need to change the conversion factor above (4.54l/g to the correct US one which I don't know of the top of my head (3.?? l/g I think).