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It is One hundred and fify trillion in the modern US usage It is One hundred and fifty billion if you use the old English billion.
Yes, both are correct.
1km is 1000 meters. 150 million km is 150 000 million meters. 150 000 million meters = 150 billion meters. (Careful I'm talking about 150 with 9 zeroes (150 000 000 000). Billion is the US name for that, but other country's names can vary.)
Fifteen quadrillion.
Forty trillion