Class 1 of the fourth grade went to climb a mountain. It took 4 hours to go up the mountain at a speed of 450 m/h. It only took 3 hours to go down the mountain. What is the speed of going down the mountain?
四年级一班同学去爬山．上山用了4小时，速度是450米/时．下山时只用了3小时，下山的速度是多少？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">450 * (4/3)</gadget>
<output>600</output>

<result>600</result>