It takes 4 hours to play a movie tape, 45 meters per hour, if it takes 3 hours to play, how many meters per hour?
一盘电影带要用4小时放完，每小时放45米，如果要3小时放完，每小时放多少米？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">45 * (4/3)</gadget>
<output>60</output>

<result>60</result>