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Q.

30 kilometers = _____ centimeters.

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a

30000

b

3000

c

3000000

d

300000

answer is A.

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Detailed Solution

1 km = 1,000 m 

1 m = 100 cm

∴ 30 km = 30 × 1,000 m = 30,000 m 

∴ 30,000 m = 30,000 × 100 cm = 30,00,000 cm 

∴ 30 km = 30,00,000 cm 

Thus, there are 30,00,000 centimetres in 30 kilometres.

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