Question

Two rods are of equal size. I t will take 60 mins to burn fully each rod. You can’t break the rod and you don’t have watch. How will you calculate 90 mins and 45 mins

Answer 1

I have ans for 90 min only that first burn fully the first rod then at the same time it finished fully then burn another rod until half of that one burn...... hence 90 minutes are calculateable.