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

Answer: 21.3 km

Step-by-step 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=$\frac{1}{1000}\ km$

Thus, the distance rode by Derrick to library = $150\times\frac{1}{1000}\ km=0.15\ km$

The distance rode by Derrick to home = 500 meters.

Thus, the distance rode by Derrick to home = $500\times\frac{1}{1000}\ km=0.5\ km$

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

Now, Distance he rode in 3 days = $3\times7.1=21.3\ km$

Answer 2

Answer:

21.3 km.

Step-by-step 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

$Total =3\times 7.1$

$Total =21.3$

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