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Kagendo made a 150kilometre journey. For the first 90km she used a bus travelling at an average speed of 60km/h and for the rest of the journey she took a matatu travelling at an average speed of 90km/h. how long did the journey take?
A. 1h 30min
B. 1h 40min
C. 2h 10min
D. 2h 30min