Step-by-Step Solution
Solution 1
To distance travelled in a time with an average speed is 
The distance traveled during walk is calculated by substitute 
and 
in the above equation
The distance traveled during run is calculated by substitute 
and 
in the above equation
The equation for the average speed of the bicycle is
Here 
is the total time and 
is the total distance travelled.
Substitute 
and 
in the above equation
Hence, option (B), (C) and (D) are incorrect answers.
The average speed of the person is
.
Hence, the option 
is the correct answer.
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