Question 1070721
90x = 120(x-1)
90x = 120x-120
-30x = -120
x = 4 hours travel time
90*4 = 360km is the distance between the towns
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Check:
If the speed is increased to 120km/h the time is reduced by 1 hour:
120*(4-1) = 360 Correct, same distance.