Jonah is playing a video racing game called Checkpoint. The speed of Jonah’s car is recorded four times during one lap. At the f
irst checkpoint, his speed is 80 miles per hour. At the second checkpoint, his speed has reduced by 5%. At the third checkpoint, Jonah’s speed has increased by the speed from the previous checkpoint. At the fourth checkpoint, his speed decreased by 20% compared with the third checkpoint. What is Jonah’s net change in speed between the first and fourth checkpoints?
80, 76, 80, 64 speeds at the 4 checkpoints. Net change in speed between the firs and fourth checkpoints is 80-64 = 16
<span> "At the third checkpoint, Jonah’s speed has increased by the speed from the previous checkpoint.</span>" The wording on this sentence is strange. Should the word "by" be changed to "to"? Then it makes perfect sense. But this isn't English is it?
