What percentage of 7 minutes is 42 seconds?
25%
20%
42%
10%
We know that 1 minute = 60 seconds
7 minutes = 420 seconds
42420×100=10%
What percentage of 1 hour is 30 minutes?
A time interval of 3 minutes and 20 seconds is wrongly measured as 3 minutes and 25 seconds. What is the percentage error?