David Cameron praised the career ambitions of a group of schoolchildren in Liberia, joking that "if you asked people in England, they'd all say they want to be popstars or footballers."
He is in Liberia to co-chair a United Nations meeting on international development targets, and visited the Anna F Whisnant Elementary School, alongside the country's president Ellen Johnson Sirleaf.
There, pupils told him they wanted to be doctors and lawyers.
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Police said the child, who was without a driving licence, was trying to make his way 2,500 miles from the east coast to Perth.
The 24-year-old was charged with 14 counts of wounding with intent to do grievous bodily harm and one count of throwing a corrosive fluid.
Winds will veer northerly overnight with colder air streaming in over the next few days.