Cricket scores

This task is about reading information from a line graph.
 
 
Here is a graph of the scores in a 50-over cricket game between New Zealand and Australia.
 
a)
i)
 
ii)
 
What was New Zealand's score after 40 overs? __________
 
What was the difference between the two teams' final scores? __________
 
b)
 
Which team scored most runs
 
 
i)
 
ii)
 
iii)
 
in the first 10 overs? ____________________
 
in the last 10 overs? ____________________
 
between overs 20 and 30? ____________________
 
c) i) Circle the part of the graph that shows when New Zealand was scoring at the fastest rate.

 
  ii)
Explain how you can tell that this is the fastest rate that New Zealand scored at just by looking at the graph.