Journey to spa

Mr. Dvorak took his wife to the spa and the journey took 3.5 hours. On the way back, he drove 12 km/h faster and was home in 3 hours. At what speed did he go to the spa and at what speed did he return?

Correct result:

v1 =  72 km/h
v2 =  84 km/h


s=v1 t1=v2 t2 t1=3.5 h t2=3 h    v1 t1=v2 t2 v2=v1+12 v1 3.5=v2 3 v2=v1+12  3.5v13v2=0 v1v2=12  v1=72=72 km/h v2=84

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