6. A boy goes from his house to school by bus at a speed of 20 Km/h and returns back through the same route at a speed of 30Km/h. the average speed of his journey is
a)24 km/hr
c)30 km/hr
b)25 km/hr
d)20 km/hr
a)24 km/hr
c)30 km/hr
b)25 km/hr
d)20 km/hr
Answers & Comments
Verified answer
Answer:
(a) 24 km/h
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.
THANKS
Answer:
a)24 km/hr
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