150 million km is a measure of distance with dimensions [L], mph (miles per hour) is a measure of speed or velocity with dimensions [LT-1]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
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1 mile ≈ 1.61 km → 150 km/h ≈ 150 ÷ 1.61 mph ≈ 93 mph
150 million kilometers = 93,205,678.8 miles.
150 million km = 1.0027 AU
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.)
150000000000 meters