20/60 x 100=33.3% (3s.f.)
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The result is 600 seconds or a decrease of 150 seconds.
21.1%
1 minute = 60 seconds ⇒ 7 minutes 20 seconds = 7 x 60 seconds + 20 seconds = 440 seconds
72000 seconds
There are 1000 milliseconds in one second. Therefore, 20 seconds is equal to 20/1000 = 0.02 seconds.