Question

Three months ago, Santos could walk 2 miles in 40 minutes. Today he can walk 2 miles in 25 minutes. Find the percent of change and round to the nearest whole percent.

Answer 1

2 miles out of 40 minutes or 2/40 is .05

2 miles out of 25 minutes or 2/25 is .08

so he increased by .03 miles per minute

Answer 2

Percent of increase in the speed will be 60%.

Explanation:

Three months ago speed of walking =
`(2)/(40)`

= 0.05 miles per minute

Walking speed of Santos today =
`(2)/(25)`

= 0.08 miles per minute

Change in speed = 0.08 - 0.05

= 0.03 miles per minute

Percent of change in the speed =
`(0.03)/(0.05)* 100`

= 60%

Therefore, percent of increase in the speed will be 60%