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A farmer has two tractors A and B. The tractors, working together can plough a farm in #2 1/2# h. One day, the tractors started to plough the farm together. After 1 hour 10 min, tractor B broke
down but A continued alone and completed the job after a further 4 h. Find:
(a) The fraction of the job done by the tractors, working together for one hour.
(b) The fraction of the job done by tractor A after B broke down.
(c) The time each tractor working alone would have taken to plough the farm.