840 centimeters

Question

hour
=

millimeters
minute

Answer 1

To convert 840 centimeters per hour to millimeters per minute, you can follow these steps:

1. Convert centimeters to millimeters:
   Since there are 10 millimeters in 1 centimeter, you can convert 840 centimeters to millimeters: \[ 840 , \text{cm} \times 10 , \text{mm/cm} = 8400 , \text{mm} \]

2. Convert hours to minutes:
   There are 60 minutes in 1 hour, so to convert per hour to per minute you divide by 60: \[ \frac{8400 , \text{mm}}{60 , \text{min}} = 140 , \text{mm/min} \]

Therefore, \(840 , \text{centimeters/hour} = 140 , \text{millimeters/minute}\).