Answer:
To return to the top of the canyon he rappelled 40 ft above .
Explanation:
Given : Manoj rappelled 30 ft down from the top of a canyon. He then rappelled an additional 10 ft down the canyon.
To find : What must he do to return to the top of the canyon.
Solution : We have given
Manoj rappelled down from the top of a canyon = 30 ft.
Again he rappelled an additional down the canyon = 10ft.
So, total distance he covered = 30 ft + 10 ft = 40 ft .
Now , He is 40 ft down from the top of the canyon .
To return to the top of the canyon he rappelled 40 ft above .
Therefore, To return to the top of the canyon he rappelled 40 ft above .