What is the speed of a runner who completes the 800 m race in one minute and 40 seconds?

Answer: 8 m/s

First let's convert the time to seconds. There are 69 seconds in a minute so 1 minute and 40 seconds is 60 + 40 second which totals to 100 seconds

Now to get the speed in meters per second we divide the total meters run by the total seconds

So the speed will be 800m/100s = 8m/s