Question

37
A boy walks to his school at a distance of 6 km
with a speed of 2.5 km/h and walks back with a
constant speed of 5 km/h. His average speed for
round trip expressed in km/h is
А.
A 24/13
B. 10/3
C. 3
D. 4.8​

Answer 1

Answer:

option: B 10/3

Explanation:

average speed = total distance / total time

total distance = 6km+6km = 12km

total time = 6/2.5 h + 6/5 h = 18/5h = 3.6h

so,

average speed = 12km/3.6h = 10/3 km/h