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To find the time it will take for the asteroid to reach Mars, we need to divide the distance by the rate at which it is moving:
Time = Distance / Rate
Time = (3.311 x 10^8 miles) / (7.7 x 10^4 mi./hr)
To divide numbers in scientific notation, we divide the coefficients and subtract the exponents:
Time = (3.311 / 7.7) x 10^(8-4)
Time = 0.429 x 10^4
Time in scientific notation, expressed to the exact decimal place, is approximately 4.29 x 10^3 hours.