A person travels from A to B at an average speed of 60 km/hr and B and C at 50 km/hr and C and D at 40 km/hr. The distance from A to B, B to C and C to D are equal. What is the average speed of the whole journey?
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Answer:
Total distance travel by A ' B ' C ' D = 60 + 50 + 40
= 150
Avg. speed = total distance / Total time
= 150 ÷ 3
= 50 km / h
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