diff --git a/第一讲 变量、输入输出、表达式与顺序语句/615.cpp b/第一讲 变量、输入输出、表达式与顺序语句/615.cpp
new file mode 100644
index 0000000..be34631
--- /dev/null
+++ b/第一讲 变量、输入输出、表达式与顺序语句/615.cpp	
@@ -0,0 +1,12 @@
+#include <cstdio>
+
+using namespace std;
+
+int main()
+{
+    int x;
+    float y;
+    scanf("%d%f", &x, &y);
+    printf("%.3f km/l", x / y);
+    return 0;
+}
\ No newline at end of file