A high-speed bullet train departs from Wuhan at 9:35 and arrives in Guangzhou at 13:35, with a total distance of about 1020 kilometers. What is its speed approximately?
一列高速动车9：35从武汉出发，13：35到达广州，全程约1020千米．它的速度大约是多少？
<gadget id="calculator">1_020 / 4</gadget>
<output>255</output>

<result>255</result>