diff --git a/1-js/09-classes/01-class/1-rewrite-to-class/solution.md b/1-js/09-classes/01-class/1-rewrite-to-class/solution.md
index e69de29bb2..6468bb01f9 100644
--- a/1-js/09-classes/01-class/1-rewrite-to-class/solution.md
+++ b/1-js/09-classes/01-class/1-rewrite-to-class/solution.md
@@ -0,0 +1,10 @@
+Solution is given in the sandbox below.
+
+once you go through it - 
+1. can you stop the clock afer 5seconds?
+2. why it is not stopping with current implementation?
+3. try printing this in the stop function ?
+4. why it is undefined ?
+5. think of ways to make it access the correct timerId
+6. try arrow function
+7. learn the difference between these two ways