Question

Which of the following is best represents the average speed of a fast runner?

10 meters per second
10 miles per second
10 centimeters per hour
10 kilometers per second
(please help eeek!)

Answer 1

The first choice (10 m/s) best represents the speed of a fast runner.

Usain Bolt's world record in the 100 Meters is 9.58 seconds.
That's 10.44 meters per second ... about 23.4 miles per hour.

The other choices are out in Lala Land:

-- 10 miles per second . . . . . 3,600 miles per hour

-- 10 centimeters per hour . . . . . 0.000062 mile per hour
(more like MY running speed, but not like a fast runner)

-- 10 kilometers per second . . . . . 22,369 miles per hour

Answer 2

i think the answer is A
a meter is equivalent to almost 2 yards
kilometers is equivalent to 1000 meters