Puzzle

First he used the big one and did puja for 7 minutes, then he used small one. And when exactly half sand remain in small sand watch (that counts 2 minutes) , he completed the puja.

Thats not the right answer Abhilasha think more may be you will get a better answer

The reason why its not a correct answer in sand watched u cant determine the exact half

He uses both togetther

When the 4 min sandwatch is complete there are 3min left in the other...So he rotates the smaller one ..When 3min complete, 1min is left in smaller one,,,so he rotates the bigger one........When 1 min complete......He has prayed for 8 mins and 1min sand is at bottom of big one.....So he rotates it again and that makes 9 min.....

It is quite lengthy but there may  be a short solution to it......but now i think this may also be right....

if wrong plzzz tell the right answer

GOOD PUZZLE

Correct answer Saurabh keep it up....................... This is the only way to answer this and there will be no shortcuts for this kind of puzzles

Thanks CA Bharat kumar 

A good puzzle posted here

Nice Puzzle...