We don’t know the average speed of the bike. Let’s assume it was b mph. The amount of time she bikes per day is t hours. So in one day she bikes bt miles. The number of days is n so nbt=32 miles.
If we know n we can find bt=32/n, which gives us the number of miles a day.
If we know b and n we can find t=32/(nb), which gives us the amount of time each day she bikes. When we find t we multiply it by b to find the distance each day.
If we know t and n we can find b=32/(nt), which gives us the bike’s average speed. When we find b we multiply it by t to get the daily mileage.