3 x 7 because three, seven times is 21
B=5
Hope this helps!
Vote me brainliest!
First we convert it in seconds.
Number of seconds in 1 minute = 60 seconds
Therefore,
Number of seconds in 4.2 minutes = 4.2 x 60 = 252 seconds.
Next we convert it in hours.
60 minutes make up an hour. So we can write,
Number of hours in 60 minutes = 1 hour
Number of hours in 1 minute = 1/60 hour
Number of hours in 4.2 minutes = 1/60 x 4.2 = 0.07 hour
Therefore, the video is 252 seconds or 0.07 hour long.
20 meter per second= 1200 m/h=1.5km/h
The time is 1300: 1.5 =866.66
get a common denominator which is 12
2 1/3 = 2 4 /12
5 3/4 = 5 9 /12
2 4/12 + 5 9/12 = 7 13/12
7 + 1 1/12
8 1/12
