© 80 sec
(d) 92 sec
A man walks on a straight road from his home
to 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) 25/4 km/h
(c) 30/4 km/h (d) 45/8 km/h
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answer is (b)i think so
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