120/90 = 1hour 20minutes , with no wind .
90 seconds
45 hours.
56
2 hours 15 minutes
A long time. Generally you should be doing situps "until failure."
Just under 15 minutes.
90 days
90 days.
the prediction is about 90 ears
He didn't do situps, silly!
90 minutes
60 to 90 days
It would depend on your speed
Depends on the speed
90 days
90 minutes