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The distance between towns S and T is 150km. Kamau drove from town S starting at 9.30 am and reached town T at 11.00 am. He
completed his business in town T at 12.50 pm and started driving back to town S reaching there at 2.30 pm. What was Kamau’s average
speed for the whole journey?
A. 90km/h
B. 100km/h
C. 60km/h
D. 50km/h