total distance: 108+42 = 150km
total time: 6hr
avg speed: 150km/6hr = 25 km/hr
A train starts from station A at 1pm and reaches station B at 3 pm, aftet travelling 108 km. It halts at station B for one hour and then starts for station c which is 42 km fron station B. It reaches station c at 7pm on the same day. The avg speed fo the train for the whole journey from A to C is:
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