Pharmacy students, traveling to attend a national pharmacy meeting, were on an airplane with an average air speed of 414 miles per hour. Which is the closest equivalent air speed?

Question

(a) 6 mi/min

(b) 257 km/h

(c) 666 km/h

(d) 180 m/s

- Show the solutions by using equivalent expressions.

Answer 1

Hey Jenson,

I'll be brief, as I put a lot of time into the version that had the wrong answer choices.

1. You have units of distance / time for all of your choices.
2. If the numerator is not the correct units, use a conversion factor that has the correct units (miles) in the numerator, and the old units in the denominator
3. For example, choice b, multiply by (1 mile/ 1.61 km)
4. If the denominator is not the correct units, do the opposite
5. For example, choice a, multiply by (1 min/ 0.0167 hr)
6. Convert each answer as necessary until they're all in miles/ hr. One should be your answer.