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It is 1/2 of a second
A coulomb is a measure of electric charge. An ampere is a measure of electric current - how much charge passes per second. 1 ampere = 1 coulomb / second.
3 to 1
There is no sensible answer to this question. A metre per second is a measure of linear velocity, with dimensions [LT-1]. A litre per second is a measure of flow rate, with dimensions [L3T-1]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
1 mile per hour equals 44.7 centimeters per second.