Question

Lin run six laps around the track in nine minutesA. How many minutes per lap is that?B. How many laps per minute is that?C. If Lin runs 21 laps at the same rate, how long does it take her?

Answer 1

A)

To find how many minutes per lap did Lin run, divide the amount of minutes over the amount of laps.

Since Lin ran six laps in nine minutes, then:

`\frac{9\text{ minutes}}{6\text{ laps}}=1.5\text{ minutes per lap}`

B)

To find how many laps per minutes is that, divide the amount of laps over the amount of minutes:

`\frac{6\text{ laps}}{9\text{ minutes}}=0.666\ldots\text{ laps per minute}`

C)

The amount of laps is given. Since it takes 1.5 minutes for Lin to run a single lap, multiply 21 times 1.5 to find the total amount of time that it takes for Lin to run 21 laps:

`21\text{ laps}*1.5\text{ minutes per lap}=31.5\text{ minutes}`