A boy goes from his house to school by bus at a speed of 20 km/h and returns back at through the same route at a speed of 30km/h .
Find the average speed
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Answer: 24 km h
Explanation: ANSWER
Let the distance between the school and the house is x km
Speed of the boy from house to school =20 km/hr.
Using formula, Time taken =
speed
distance
.
So, time taken =
20
x
hours.
Also,Speed of the boy from school to the house =30 km/hr
So, time taken =
30
x
hours.
Total time taken =
20
x
+
30
x
=
12
x
hours
Also total distance covered by boy =x+x=2x km.
Using formula,
Average speed =
Totaltime
Totaldistance
=
12
x
2x
=24 km/hr.
Thus, average speed of the boy's journey is 24 km/hr.
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