Average Practice Test 1

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Question : 34 of 40

Marks: +1, -0

A person covers 15 km at 5 km/h, 20 km at 7 km/h and 24 km at 4 km/h. What is his average speed in covering the whole distance?

4 km/h
4.75 km/h
4.25 km/h
3.25 km/h
None of these

Solution:

\Time = {\Distance}/{\Speed}

Total time

=(15/3+20/7+24/4)\hrs

= 13.85 hrs
Average speed

={15+20+24}/13.85

= 4.25 km/h

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