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Ratios, Rates, Proportional Relationships, and Units

SAT Math· difficulty 4/5

A signal travels at 300,000300{,}000 km/s. How many meters does it travel in 11 microsecond (10−610^{-6} s)?

  • A

    30{,}000 m

  • B

    30 m

  • C

    300 m

    check_circle
  • D

    3{,}000 m

Explanation

300,000300{,}000 km/s =3×108= 3 \times 10^8 m/s. In 10−610^{-6} s, it goes 300300 m.

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