The convoy transported a batch of relief tents to the Ya'an disaster area, traveled 75km per hour, and reached the disaster area in 6 hours. When returning, travel 60km per hour, how long will it take to return to the starting point? (solution by equation)
车队向雅安灾区运送一批救灾帐篷，去时每小时行75km，6小时到达灾区．回来时每小时行60km，多长时间能返回出发地？(用方程解)
<gadget id="calculator">75 * 6</gadget>
<output>450</output>

<gadget id="calculator">450 / 60</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>