Question

Express in second 

1. 3 minute 15 second and 

2. 5 hour 2 minute 5 second.

Answer 1

1. 3 minute = 15 second 

1 minute = 60 second 

3 minutes 15 second = 60 × 3 + 15 

= 180 + 15 

= 195 seconds

2. 1 minute =60 second 

2 minutes =2 × 600 = 120 second …...........(1) 

1 hour 3600 second

5 hour 3600 × 5 = 18000 second ….............(2) 

5 hour 2 minutes and 5 second 

= 18000 + 120 + 5 = 18125 seconds