Partition a number line from 0 to 1 into fifths. decompose 2/5 into 4 equal lengths.

Required parts are [0, 0.1), (0.1, 0.2) (0.2,0.3) (0.3, 0.4] having length = 1/10

Step-by-step explanation:

Here when we divide number line from 0 to 1.

Then we get five equal parts, [0,0.2) (0.2,0.4)  (0.4, 0.6) ( 0.6, 0.8) (0.8,1]

Where each having length = 1/5

Now, since 2/5 part of  [0,1] is [0,0.2]

When we decompose  [0,0.2] into four equal parts then these parts are,

[0, 0.1), (0.1, 0.2) (0.2,0.3) (0.3, 0.4]

Where each having length = 1/10

Required parts are [0, 0.1), (0.1, 0.2) (0.2,0.3) (0.3, 0.4] having length = 1/10

Step-by-step explanation: Here when we divide number line from 0 to 1.

Then we get five equal parts, [0,0.2) (0.2,0.4)  (0.4, 0.6) ( 0.6, 0.8) (0.8,1]

Where each having length = 1/5

Now, since 2/5 part of  [0,1] is [0,0.2]

When we decompose  [0,0.2] into four equal parts then these parts are,

[0, 0.1), (0.1, 0.2) (0.2,0.3) (0.3, 0.4]

Where each having length = 1/1 <3

1 1/4 hours

step-by-step explanation:

2/4 + 2/4 + 1/4 = 5/4 or 1 1/4

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m