Postal or Sorting Assistants Model Paper 3 With Solutions

Question : 4 of 100

Marks: +1, -0

During a journey of 80 km a train covers first 60 km with a speed of 40 km/h and completes the remaining distance with a speed of 20 km/h. What is the average speed of the train during the whole journey?

30 km/h
32 km/h
3 6 km/h
40 km/h

Validate

Solution:

(b) Average speed =

\text"Total distance"/\text"Total time"

80/{60/40+10/20}=80/2.5=32.km/h

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