27 is 30 % of what number? Whole

90

Step-by-step explanation:

27 = 30%

Multiply both sides by 3:

81 = 90%

We need 10% more to get 100%, so since 27 is 30%, you need to divide 27 by 3 to get 10%:

9 = 10%

Add it to the previous equation:

90 = 100%

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