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Well, isn't that just a happy little question! If a car travels 120 miles in two hours, we can find its speed by dividing the distance by the time. So, 120 miles divided by 2 hours equals 60 miles per hour. That car is cruising along at a nice, steady pace!
120/3 = 40 miles per hour. So it will take 1 hour to go 40 miles.
If it travels 210 miles in 5 days it travels 210 divided by 5 miles in one day. 210 / 5 = 42 miles per day So in 8 days it goes 42 miles times 8 42 * 8 = 336 miles
If the bicycle travels 4 miles for the car's 30 miles, then if you divide both numbers by 3 you'll see that the bicycle travels 1 and 1/3rd miles for each 10 miles that the car travels. So, if the car travels a further 10 miles (and has now gone 40 miles) the bicycle will travel a further 1 and 1/3rd miles and its total travelled would be 5 and 1/3rd miles.
Average speed is the total distance traveled divided by the elapsed time. A car that travels 60 miles in one hour, stops for one hour and travels 60 miles for another hour, has an average speed of 120 miles / 3 hours, which is 40 mph.