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The distance between India and Singapore is 5040 km.
Rose flew a plane from India to Singapore at 1000.
At first, she travelled at a speed of 800 km/h for the first 4 hours of the journey.
After that, she increased her speed by 120 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: