On Saturday, the students of the science group of Experimental Primary School were led by the teacher to visit the nearby mountain. They stopped on the way and shouted at the mountain. After about 2.24 seconds, they heard the echo from the mountain. The speed of the sound is known to be 340 m/s, what is the distance between them and the mountain at this time?
周六实验小学科学小组的同学在老师的带领下去附近的大山考察，途中停下，他们对着大山齐喊了一声，约经过2.24秒听到从大山传回的回音，已知声音的速度是340米/秒，算一算这时他们离大山的距离是多少？
<gadget id="calculator">2.24 / 2</gadget>
<output>1.12</output>

<gadget id="calculator">340 * 1.12</gadget>
<output>380.8</output>

<result>380.8</result>