a cyclist went 1km up a hill at 15km per hour then she went 1km down the hill at 30km per

a cyclist went 1km up a hill at 15km per hour then she went 1km down the hill at 30km per hour show that her average speed was 20km per hour
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time1= (1/15)

time2=(1/30)

total time=(1/15) +(1/30)=3/30=1/10

distans=2km

averaej speed=distans/(total time)

=2/(1/10)

=2*10

=20

####note that (15+30)/2=45/2=22.5

so averaej speed is NOT averaej av 2 speeds
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