Rakesh covers 12 km at 6 km/hr, 36 km at 9 km/hr and then 32 km at 4 km/hr. Find the approximate average speed in covering the whole distance.
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The average speed in covering the whole distance can be found by the following formula:
Avg speed= Total Distance/ Total time
Here, Total Distance= 12km+ 36km + 32km= 80km
Individual times are found out at first:
Time= Distance/Speed
T1= 12/6= 2hours
T2= 36/9= 4hours
T3= 32/4= 8hours
Total time= 14 hours
Therefore,
Avg speed= 80/14= 5.71 km/hr(Ans)
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