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​Q15: Question – Paper 3– June 2017
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15)
The graph shows the depth of water in a harbour for 12 hours.
  • d is the depth of water in a harbour in metres
  • t is the number of hours after 9 am
a) For how many of the 12 hours is the depth more than 5 metres?
[1 mark]

b) ​By how much does the depth change between 12 noon and 4 pm?
[1 mark]