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 answer:

v1 =  72 km/h
v2 =  84 km/h

Step-by-step explanation:

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  Row23.51 Row1Row2 3.5v13v2=0 0.14v2=12  v2=0.1428571412=84 v1=3.50+3v2=3.50+3 84=72=72 km/h  v1=72 v2=84



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