A Man took the car and travel from Bangalore to Mangalore by his car at the speed of 30 km hr and th...........

Quant (SSC) Average

A Man took the car and travel from Bangalore to Mangalore by his car at the speed of 30 km//hr and then, the same distance he travelled on his bicycle at the speed of 20 km/hr from Mangalore to Mysore. Then he returned from Mysore to Bangalore via Mangalore at the speed of 16 km/hr on his foot. The average speed of the whole journey is:

20km/hr

21.5km/hr

22km/hr

19.2 km/hr

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Explanation:

Solution:
The distance between Bangalore and Mangalore is equal to distance between Mangalore and Mysore.
So the average speed is 2*30*20/(20+30)=24km/hr
Again he return from same route the distance is same
Then the average is 2*24*16/(24+16)=19.2km/hr