Mr. Munroe, P.S.: The correct expression for the derived unit "kilometers per hour" is the symbol km/h, not "kph." Using km/h would also be consistent with your use of the correct derived unit and symbol for speed, m/s.
Also, the value "3 L" is explained as a "two-liter bottle." Paul Trusten, R.Ph. Public Relations Director U.S. Metric Association, Inc. www.metric.org 3609 Caldera Blvd. Apt. 122 Midland, Texas 79707-2872 US +1(432)528-7724 trus...@grandecom.net