Question

James covers a distance of 8 meters in the first second of a 100 meter race. Then, he sprints at a speed of 9 meters per second. How far is James from the finish line 9 seconds after the race has started?



a.

11

c.

28


b.

20

d.

80

Answer 1

@stgreen

Answer 2

@TimSmit

Answer 3

Ok so let's break it down:
We want to know how far he has gotten after 9 seconds.
We also know that he runs 8 meters in the first second, which means that we only have to look at the last 8 seconds.

Answer 4

According to the question, after the first second, he runs at a speed of 9 meters per second. We were interested in the 8 seconds after his 'starting up' period of one second.
The distance he covers in those 8 seconds at a speed of 9 meters per second is?