A boy goes from his house to school by bus at a speed of 20 km per hour and returns back through the same route at a speed of 30 km per hour. The average speed of his journey is.
Answers
Answer:
Average Velocity=v1+v2/2
=v1=20km/h
v2=30km/h
Average velocity=20+30/2
=50/2
Average velocity=25km/h
Answer:
average speed of the boy's journey is 24 km/hr.
Explanation:
distance between the school and the house is x km
speed of the boy from house to school = 20 km/hr.
formula, Time taken = distance/speed
time taken = x/20 hours.
Speed of the boy from school to the house = 30 km/hr
time taken = x/30 hours.
Total time taken = x/20 + x/30
= x/12 hours
Also total distance covered by boy = x +x
= 2 x km.
formula,
Average speed = Total distance/ Total time
= 2 x/(x/12)
= 24 km/hr.
average speed of the boy's journey is 24 km/hr.