Which conversion factors can be used to multiply to 4 km/min to get meters per hour?

select each correct answer.

60 min/1 h

1000 m/1 km

1 km/1000 m

1 h/60 min

option B and D (1000m/km and minute/60 second)
In this question, we have two unit that needed to be converted, kilometer/minutes into meter/second.
First, we need to convert km into the meter. One kilometer is equal to 1000 meter. To change kilometer into the meter, the unit used for multiplication should be 1000m/km which is option B.
Then we need to convert minute into the second. One minute is equal to 60 seconds. To change "/minute" into "/second" the multiplication unit should be minute/60 second which was option D

Hello!
volume of sphere =4/3.pi.r^3

The answer should be c.