Question

On each of 3 days, Derrick rode 6.45 km to school, 150 meters to the library, and then 500 meters back home. how many kilometers did he ride for the 3 days altogether?

Answer 1

21.3 km.

Explanation:

On each of 3 days, Derrick rode 6.45 km to school, 150 meters to the library, and then 500 meters back home.

We know that

1 km = 1000 m

6.45 km = 6450

Total distance covered by Derrick in one day = 6450+150+500 meters

= 7100 meters

=7.1 kilometers

The distance covered by Derrick on each day is 7.1 km. So, the distance covered by Derrick in 3 days is

`Total =3* 7.1`

`Total =21.3`

Therefore, Derrick rides 21.3 km for the 3 days altogether.

Answer 2

Answer: 21.3 km

Explanation:

Given: On each of 3 days the distance traveled by Derrick to school = 6.45 km

The distance rode by Derrick to library = 150 meters

Since, 1 m=
`(1)/(1000)\ km`

Thus, the distance rode by Derrick to library =
`150*(1)/(1000)\ km=0.15\ km`

The distance rode by Derrick to home = 500 meters.

Thus, the distance rode by Derrick to home =
`500*(1)/(1000)\ km=0.5\ km`

Distance he rode in each day =
`6.45+0.15+0.5=7.1\ km`

Now, Distance he rode in 3 days =
`3*7.1=21.3\ km`