How many ways are there to make $20 using $10-bills, $5-bills and/or $1-bills?

8

Step-by-step explanation: 10+10

10+5+5

5+5+5+5

10+1+1+1+1+1+1+1+1+1+1

1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1

5+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1

5+5+1+1+1+1+1+1+1+1+1+1

5+5+5+1+1+1+1+1

10+5+1+1+1+1+1

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.