A sailor judges the distance to a lighthouse by holding a ruler at arm’s length and measuring the apparent height of the lighthouse. He knows that the lighthouse is actually 60 feet tall. If it appears to be 3 inches tall when the ruler is held 2 feet form his eye, how far away is it?
.
.
ขอบคุณล่วงหน้าสำหรับทุกท่านที่เข้ามาแบ่งปันความรู้ค่ะ