# Math

A car engine is running at 5000 revolutions per minute.
(a) how many revolutions are made in one hour?
(b)if this engine uses 10 litres of fuel in one hour, how much fuel, in millilitres,does it use for every revolution?

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1. rev/hr = rev/min * 60min/hr

L/rev = L/hr * hr/rev = (L/hr)/(rev/hr)
mL/rev = L/rev * 1000mL/L

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