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A bus B1, left a town T1 for another town T2 at 6:00 am at 7:30 am. Another bus B2 also left T1 for T2 and the speed of this bus was 5 km/h more than that of B1. At 10:30 pm on the same day the buses were 21 km apart. Find the speed of bus B1.
i. 36 ii. 64 iii. 72