Distance between two cities

The car went from A to B in 4 hours. The car was up 15 km/h faster on the way back. The return trip took 48 minutes shorter than the way there. Find the distance of cities A and B.

Correct answer:

x =  240 km

Step-by-step explanation:

t1=4 h t2=t16048=46048=604 606048=602406048=6024048=60192=516=3.2 h  x = v t1 x = (v+15) t2  v t1=(v+15) t2 v 4=(v+15) 3.2  0.8v=48  v=0.848=60  v=60  x=v t1=60 4=240 km

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