Hannah needs to drink 60 ml of water for each kilometer she runs. If her gym teacher tells her to run 8 laps and each lap is 0.25 km, how many milliliters of water will Hannah need to drink?
First find the total number of kilometers Hannah runs: 8 laps * .25 km/lap = 
<gadget id="calculator">8*.25</gadget>
<output>2</output>
2 km.
Then multiply the number of kilometers she runs by the amount of water she needs per kilometer to find the total amount of water she needs: 60 ml/km * 2 km = 
<gadget id="calculator">60*2</gadget>
<output>120</output>
120 ml.

<result>120</result>