Question

Suppose we represent the distance above the ground Suppose we represent the distance above the ground by a positive integer and that below the ground by a negative integer then answer the following
1 )an elevator descends into a mine shaft at the rate of 5meter per minute. What will be its position after one hour.
2) it began to descend from 15 meter above the ground. What will be its position after 45 minute.

Answer 1

1. distance covered in 60 second
= 5metre
distance covered in 1 sec.......5 /60
distance covered in 3600 second.....
=1/12×3600
= 300metre