Presumably the question should have been something like "How many pennies can be placed side-by-side to make up a length of 1 kilometre".
Unfortunately, many countries use a penny as a currency unit and they are not the same size. So there cannot be a definitive answer.
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One kilometre is 100,000 centimetres
240 pennies in one sovereign
1,000,000
100,000 pennies
How many what? metres?? 1000 metres in a km.