3 feet
The commonsense answer is to leave the amount of room that the cyclist would occupy if he fell from his bike, and that includes space for the fallen bike too, and even more to make certain.
1.5 meters
It will take him 7 hours 30 minutes.
As much as is safe for the prevailing conditions.
Three if it hits a bicyclist. I can say that from experience. At least I think it was three; was pretty hard to approximate after I rolled off the hood.
There are three syllables. Bi-cy-clist.
200 feet
100 feet
17.6 feet/second*60 seconds/minute*60 minutes/hour=63360 feet per hour there are 5280 feet in a mile 63360 feet/hour*mile/5280 feet=12 miles per hour 90 miles/12 miles per hour=7.5 hours
100 feet
550 feet.