The correct option is D 63:20
As per the question, one quantity is in weeks and another is in minutes.
So, we need to convert the number of weeks to the number of minutes.
1 week = 7 days, 1 day = 24 hrs and 1 hr = 60 mins
So, 3 weeks = (7×3×24×60) mins
Hence, 3 weeks : 9600 mins =7×3×24×609600=6320