diff -r a0fd05d1e117 -r 26b5a843c696 solutions5/bf.scala
--- a/solutions5/bf.scala	Thu Dec 06 13:52:50 2018 +0000
+++ b/solutions5/bf.scala	Thu Dec 06 15:15:31 2018 +0000
@@ -216,7 +216,7 @@
   val start = System.nanoTime()
   for (i <- 0 until n) code
   val end = System.nanoTime()
-  (end - start)/1.0e9
+  (end - start)/(n * 1.0e9)
 }
 
 time_needed(1, run(b1))