In a bowl, the number of marbles gets doubled after every minute. If the bowl gets filled after two hours of such process, how long do you think it will take for it to be half filled. Choose the correct choice:	A) 1 hour and 59 minutes	B) 2 hour and 59 minutes	C) 4 hour and 59 minutes	D) 4 hour and 59 minutes	E) 5 hour and 59 minutes
Solution:   The correct way to solve this question is go backwards. If the number of marble gets doubled every minute and after two hours, it is filled completely, one minute ago it would be half.   So, it will take 1 hour and 59 minutes for it to be filled half.   1 hour and 59 minutesnswer 1 hour and 59 minutes
<result>A</result>
In a bowl, the number of marbles gets doubled after every minute. If the bowl gets filled after two hours of such process, how long do you think it will take for it to be half filled.