Riding a proportion of 15 is 1 and a half percent of what number

1000

Explanation:

15=1.5%

1000=100%

10=1%

not really much of an explanation, but i hope you get what i mean by that

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

600,000,000,000, or 6e14

step-by-step explanation: