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t=s1/v1
t=v2/s2
s1/v1=s2/v2
24/v1=32/v1+20
32v1=24v1+480
8v1=480
v1=60
droga przjechana | 24km | 32
32x=24(x+20)
32x=24x+480
32x-24x=480
8x=480 |:8
x=60km/h
Odp.: Samochód jechał z prędkością 60 km/h.