The Tour de France is 2162miles long. A cyclist knows his average speed his 12.37 miles/hour from his previous races. For the Tour de France the cyclist knows he will cycle for 10 hours a day. Estimate how many days it will take him to complete the race.

First you must figure out your estimates, in this case you can round 2162 down to 2000 and 12.37 to 10 to make your solutions easier. First you must calculate the total number of hours it is going to take him to complete the race overall, to do this you divide 2000 by 10. This tells you the cyclist takes 200 hours to complete the race. To work out how many days it will take him to cycle the 200 hours you divide this by 10. This tells you it takes him 20 days to complete the race.