Manoj rappelled 30 ft down from the top of a canyon. He then rappelled an additional 10 ft down the canyon.

What must he do to return to the top of the canyon?

To return to the top of the canyon, Manoj must ascend 10 ft to reach his final starting position and then ascend an additional 30 ft to reach the top of the canyon. Hence, he must ascend a total of 40 ft.

To return to the top of the canyon, Manoj must ascend a total of 40 ft.