diff --git a/koyakusu.rb b/koyakusu.rb
old mode 100755
new mode 100644
diff --git a/koyakusu_fix.rb b/koyakusu_fix.rb
old mode 100755
new mode 100644
diff --git a/speed.rb b/speed.rb
new file mode 100755
index 0000000..9543497
--- /dev/null
+++ b/speed.rb
@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+#-*- coding:utf-8 -*-
+
+def time(distance,speed)
+  printf("%dmを分速%dmで走ると何分かかる?\n",distance,speed)
+  x = gets.to_i
+  answer ==  distance/speed
+  if x == answer || x == answer + "分"
+    puts"正解!"
+  else
+    puts"不正解..."
+  end
+end
+
+time(1000,25)
+time(250,25)
+time(2000,40)
diff --git a/time.rb b/time.rb
new file mode 100755
index 0000000..684f250
--- /dev/null
+++ b/time.rb
@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+#-*- coding:utf-8 -*-
+
+def time(distance,speed)
+  printf("%dmを分速%dmで走ると何分かかる?\n",distance,speed)
+  x = gets.to_i
+  answer =  distance/speed
+  if x == answer || x == answer + "分"
+    puts"正解!"
+  else
+    puts"不正解..."
+  end
+end
+
+time(1000,25)
+time(250,25)
+time(2000,40)