the average speed of a person driving to school is 30km/h on the return trip along same route the average speed is 25km/h what average speed round trip to school
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school to return trip
let distance be x
speed=25 km/h
time= distance/speed=x/25
trip to school
let distance be x
speed=30 km/h
time=distance/time=x/30
total distance= x+x=2x
total time=x/25+x/30
=6x+5x/150
=11x/150
average speed= (11x/150)/2x
= 150/11x*2x
=27.27km/h
school to return trip
let distance be x
speed=25 km/h
time= distance/speed=x/25
trip to school
let distance be x
speed=30 km/h
time=distance/time=x/30
total distance= x+x=2x
total time=x/25+x/30
=6x+5x/150
=11x/150
average speed= (11x/150)/2x
= 150/11x*2x
=27.27km/h
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