Since 1997, my country's railways have increased their speed many times. There is a train that originally traveled 90 km per hour. After the speed increase, the speed of this train increased by 50% compared to the original speed. How many kilometers per hour is the train traveling now?
从1997年至今，我国铁路进行多次提速，有一列火车，原来每时行驶90km，提速后，这列火车的速度比原来增加了50%．现在这列火车每时行驶多少千米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">90 * (3/2)</gadget>
<output>135</output>

<result>135</result>