Derrick has visited his grandparents for 5 weeks every summer for six years how many days has he visited his grandparents

210 Days

Step-by-step explanation:

First, multiply the number of weeks by the number of years.

5*6=30

Then, multiple the 30 weeks by the number of days in a week.

30*7=210

ok

step-by-step explanation:

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.