In a bowl, the no. 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 answer.
A) 1 hr 48 mins	B) 1 hr 39 mins	C) 1 hr 49 mins	D) 1hr 59 mis	E) 1 hr 58 mins
Correct Answer : D   If you go backward , if the no. of marbles gets doubled after every minute and after two hours. it is filled completely. one minute ago it would be half.
<result>D</result>
In a bowl, the no. 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?