A man drives from city to city in 4 hours 10 minutes and returns to city in 3 hours 20 minutes. Find the average speed of the whole journey.

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answer is C.

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Detailed Solution

Concept- The average speed has been computed by dividing the total distance travelled by the total time spent. It is given that the distance between city

and city

The total distance travelled by a man by taking twice the distance from city A to city B is

It is also given that the time taken by a man from city A to city B is 4 hours 10 minutes and time taken from city B to city A is 3 hours 20 minutes.
Then, the total time taken is 4 hours 10 minutes

hours 20 minutes

hours 30 minutes
When converting the total time taken in hours, we get
7 hours 30 minutes

hours

7.5hours
We know that speed

Therefore, average speed is

Hence, the correct answer is option (3).

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