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.
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Plz mark as brainliest, final answer is 24km/h
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Answer:
Thing we have
t1 = 20 (going to school)
t2= 30 (coming from school)
avg.speed= s1+s2/s1+s2/t1+t2
=2s/s(1/20+1/30)
2*60/5
120/5
24
So the avg.speed is 24 km per hour
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