Question

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Convert 80 km/h to mi./min. Use the fact that 1 mi. ≈ 1.6 km.

Answer 1

0.83 mi/min

Explanation:

Start with 80 km/hr. Convert this to the units miles/hr:

(80 km/hr)(1 mile/1.6 km) = 50 miles/hr

Next, apply the equality 60 min / 1 hr = 1 to 50 miles/hr:

50 miles. 1 hr

------------- * ------------ = 5/6 mi/min, or 0.83 mi/min

hr 60 min