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The distance between China and Singapore is 2520 km.
Mary flew a plane from China to Singapore at 0900.
At first, she travelled at a speed of 400 km/h for the first 4 hours of the journey.
After that, she increased her speed by 60 km/h for the rest of the journey.
(a) What was her average speed for the whole journey?
(b) What time did she reach Singapore?
Notes to student: