i know that 60 and 60 is 120 but the .4 has me very confused
9 Answers

2 minutes is 60+60 = 120 seconds.
0.4 of a second is 60*0.4 = 24 seconds.
120 + 24 = 144

2 minutes = 120 seconds
0.4 minutes is 4/10, so 4/10 of 60 = 24 seconds
then
120 seconds + 24 seconds = 144 seconds.

Since it is 60 seconds equals to a minute, it is 60 seconds+60 seconds=120 seconds.
You just multiply 0.4 by 60 which will give you 24.
120+24=144 seconds.
Hopefully, that helps you.
Hooah!

1 minute = 60 seconds
2.4 minutes = 144 seconds

1 minute = 60 seconds
2.4 minutes × 60 seconds/minute = 144 seconds

60 * 0.4 = 24
60 + 60 + 24 = 144

2.4 minutes = (2.4) x (60) seconds = 2.4 x 60 Seconds = 144 seconds
Here you need to understand 0.4 minutes
1 minute has 60 seconds
hence 0.4 minutes will have = 0.4 x 60 = 24 seconds

1 minute = 60 second
Hence, 2.4 minutes = 2.4 minutes * 1 minute,
and we know that 1 minute = 60 seconds
Thus, 2.4 minutes = 2.4 * 60 = 144 seconds

(60)*(2.4) =144 ..................Ans( because 1 minute) =60 seconds