Tyler and pearl went on a 20km bike ride that lasted for 3 hours. because of steep hills or the trail, they walked for most of the trip. their walking speed was 4km/hr. their riding speed was 12km/hr. how much time did they spend walking?

1 hour

Step-by-step explanation:

Let the distance they walked be in time and the distance they walked be in time ,then

Walking speed=

Riding speed=

Also the total time taken=3 hours

∴...(1)

Since the total distance= 20 km

∴

Thus, the they spent 1 hour time in walking.

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.