sally runs 5km in 25 minutes. she plans to run in 20 km race. based on the current speed how long will it take her to complete the race?

Given:

Sally runs 5km in 25 minutes.

Total distance of race = 20 km

To find:

How long will it take her to complete the race?

Solution:

We have,

Time taken by Sally for 5 km = 25 minutes

Time taken by Sally for 1 km = minutes

                                               = 5 minutes

Time taken by Sally for 20 km = minutes

                                               = 100 minutes

                                               = 1 h 40 minutes               [ 1 h = 60 min]

Therefore, the time taken by Sally to complete the race is 1 h 40 minutes.        

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.