Four students investigated the effect of catalase on hydrogen peroxide.
Each student started a digital clock at the beginning of the experiment and stopped the clock after 25 bubbles had been counted.
The time recorded on the digital clock is shown below.
Which of the times recorded by the students is appropriate for this experiment?
1 )
1.34 minutes
2 )
1 minute 33.54 seconds
94 seconds
4 )
93.54 seconds
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