estimating II

please estimate:

1. the area of the Sahara desert in square miles?
2. a maximum speed for a Cheetah to run?
3. the number of litres in an average bath?
4. words to a daily newspaper (one with quite a few words in)?
5. the length of the largest recorded whale?
6. a very hot oven's temperature?
7. times a spot on a car tyre touches the ground in a km?

answers:

1. 3 million (area of UK = 94, 251 sq miles, Sahara = 31.83 UK)
2. 70 mph
3. 140 litres
4. 100, 000 words
5. 29m
6. 260 degrees C
7. 500 (an interesting calculation, diameter seems to be around 73.5cm)