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The distance between Toon town and Boom town was 828 km.
Geraldine started driving a bus from Toon town to Boom town at 0900.
At first, she drove at a speed of 80 km/h for the first 4 hours of the journey.
After that, she increased her speed by 47 km/h for the rest of the journey.
(a) What was her average speed for the whole journey?
(b) What time did she reach Boom town?
Notes to student: