Question

How much does a watch lose per day, if its hands coincide every 64 minutes?

Answer 1

As 55 min. spaces are covered in 60 min.

=> 60 min. spaces are covered in = 60/55 * 60 = 65 5/11 min.

Now, loss in 64 min. = 65 5/11 - 64 = 16/11 min.

=> Loss in 24 hrs = 16/11 * 1/64 * 24 * 60 = 32 8/11 min.

Hence,loss in a day or 24 hrs = 32 8/11 min.