Multiples of 15 are: 15,30,45,60,75,90,105,120,135,150,165,180,195,210,225,240,255,270,285,300,315,330,345,360,375,390,405,420,435,450,465,480,495,510,525,540,555,570,585,600,615,630,645,660,675,690,705,720,735,
If it's one fifth scale, take it times five to get the whole scale. 8 times five equals 40. The car is 40" long, 3' 4" long, or three and one third feet long.