Brittany's teacher arrived one third of the way through their science class. She apologised for being late and explained her previous class had run 15 minutes over time and it had taken her 6 minutes to walk to the teacher's lounge to change her books and a further 4 minutes to walk to their classroom. Overall, how long is Brittany's science class?
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Answer:
75 min or 1 hour 15 min
Step-by-step explanation:
Total time Brittany's teacher's last class was extended = 15 min
time taken by Brittany's teacher to change her books = 6 min
time taken by Brittany's teacher to reach brittany's classroom after changing her books = 4 min
Total time taken by Brittany's teacher to reach Brittany's classroom = 15 + 6 + 4 = 25
Total time in science class wasted = 1/3 part
So this means that 25 min is 1/3rd of the total time in the science class
=> 25 = 1/3
=> 25*3 = 75
So the total time in science class is 75
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