A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 min. is equal to
A
5 km/h
B
km/h
C
km/h
D
km/h
Text Solution
Verified by ExpertsThe correct answer is:
D
Time taken in going to market 
As we are told to find average speed for the interval 40 min., so remaining time for consideration of motion is 10 min.
So distance travelled in remaining 10 min
= 
Hence, average speed = 
= 
.
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