Distance between two cities

Car went from A to B 4h. On the way back, the car was up 15km / h faster. The return trip took 48 minutes. Shorter than the way there. Find the distance of the cities A and B.

Correct result:

x =  240 km

Solution:


x = 4 v
x = (v+15)(4-48/60)

x = 4•v
x = (v+15)•(4-48/60)

4v-x = 0
192v-60x = -2880

v = 60
x = 240

Our linear equations calculator calculates it.



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