Roger runs a marathon. His friend Jeff rides behind him on a bicycle and clocks his speed every 15 minutes. Roger starts out strong, but after an hour and a half he is so exhausted that he has to stop. Jeff’s data follow:

(a) Assuming that Roger’s speed is never increasing, give upper and lower estimates for the distance Roger ran during the first half hour.
(b) Give upper and lower estimates for the distance Roger ran in total during the entire hour and a half.

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Time since start (min) 0 15 Speed (mph) 30 45 60 75 90 8 7 0 12 11 10 10