To convert 80 km/h to miles, follow these steps:

Step 1: Identify the conversion factor

1 km = 0.621371 miles

Step 2: Set up the equation

80 km/h x (0.621371 miles/1 km) = ?

Step 3: Cancel out the units

km in the numerator and denominator cancel out, leaving only miles in the numerator

80 x 0.621371 miles/h = ?

Step 4: Solve the equation

80 x 0.621371 = 49.70968

Step 5: Round the answer to the appropriate number of significant figures

49.7 miles/h

Therefore, 80 km/h is equivalent to 49.7 miles/h.

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